398120984 has 64 divisors (see below), whose sum is σ = 824947200. Its totient is φ = 179283456.

The previous prime is 398120971. The next prime is 398121023. The reversal of 398120984 is 489021893.

It is a happy number.

It is a super-2 number, since 2×398120984² = 317000635802256512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 919232 + ... + 919664.

It is an arithmetic number, because the mean of its divisors is an integer number (12889800).

Almost surely, 2^398120984 is an apocalyptic number.

It is an amenable number.

398120984 is an abundant number, since it is smaller than the sum of its proper divisors (426826216).

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

398120984 is a wasteful number, since it uses less digits than its factorization.

398120984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 744 (or 740 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 398120984 is about 19952.9693028381. The cubic root of 398120984 is about 735.6507627527.

Subtracting 398120984 from its reverse (489021893), we obtain a palindrome (90900909).

The spelling of 398120984 in words is "three hundred ninety-eight million, one hundred twenty thousand, nine hundred eighty-four".