1398495438 has 48 divisors (see below), whose sum is σ = 3116290320. Its totient is φ = 452936448.

The previous prime is 1398495433. The next prime is 1398495503. The reversal of 1398495438 is 8345948931.

1398495438 is a `hidden beast` number, since 1 + 3 + 98 + 4 + 9 + 543 + 8 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398495431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 862993 + ... + 864611.

It is an arithmetic number, because the mean of its divisors is an integer number (64922715).

Almost surely, 2^1398495438 is an apocalyptic number.

1398495438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1398495438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1558145160).

1398495438 is an abundant number, since it is smaller than the sum of its proper divisors (1717794882).

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

1398495438 is a wasteful number, since it uses less digits than its factorization.

1398495438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2961 (or 2958 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The square root of 1398495438 is about 37396.4629076066. The cubic root of 1398495438 is about 1118.2880515621.

The spelling of 1398495438 in words is "one billion, three hundred ninety-eight million, four hundred ninety-five thousand, four hundred thirty-eight".