398051680 has 96 divisors (see below), whose sum is σ = 1047816000. Its totient is φ = 141883392.

The previous prime is 398051671. The next prime is 398051707. The reversal of 398051680 is 86150893.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 57021 + ... + 63619.

It is an arithmetic number, because the mean of its divisors is an integer number (10914750).

Almost surely, 2^398051680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 398051680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (523908000).

398051680 is an abundant number, since it is smaller than the sum of its proper divisors (649764320).

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

398051680 is a wasteful number, since it uses less digits than its factorization.

398051680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6656 (or 6648 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 398051680 is about 19951.2325433794. The cubic root of 398051680 is about 735.6080734688.

The spelling of 398051680 in words is "three hundred ninety-eight million, fifty-one thousand, six hundred eighty".