1398025980 has 120 divisors (see below), whose sum is σ = 4723088832. Its totient is φ = 344124288.

The previous prime is 1398025963. The next prime is 1398026027. The reversal of 1398025980 is 895208931.

It is a happy number.

1398025980 is a `hidden beast` number, since 1 + 398 + 0 + 259 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 12132 + ... + 54251.

Almost surely, 2^1398025980 is an apocalyptic number.

1398025980 is a gapful number since it is divisible by the number (10) 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 1398025980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2361544416).

1398025980 is an abundant number, since it is smaller than the sum of its proper divisors (3325062852).

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

1398025980 is a wasteful number, since it uses less digits than its factorization.

1398025980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66417 (or 66406 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1398025980 is about 37390.1856106653. The cubic root of 1398025980 is about 1118.1629056344.

The spelling of 1398025980 in words is "one billion, three hundred ninety-eight million, twenty-five thousand, nine hundred eighty".