1398521376 has 144 divisors (see below), whose sum is σ = 4713718464. Its totient is φ = 399561984.

The previous prime is 1398521363. The next prime is 1398521389. The reversal of 1398521376 is 6731258931.

1398521376 is a `hidden beast` number, since 1 + 3 + 98 + 521 + 37 + 6 = 666.

1398521376 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1398521363) and next prime (1398521389).

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41586 + ... + 67278.

It is an arithmetic number, because the mean of its divisors is an integer number (32734156).

Almost surely, 2^1398521376 is an apocalyptic number.

1398521376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398521376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2356859232).

1398521376 is an abundant number, since it is smaller than the sum of its proper divisors (3315197088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1398521376 is an equidigital number, since it uses as much as digits as its factorization.

1398521376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25725 (or 25705 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 1398521376 is about 37396.8097035028. The cubic root of 1398521376 is about 1118.2949651769.

The spelling of 1398521376 in words is "one billion, three hundred ninety-eight million, five hundred twenty-one thousand, three hundred seventy-six".