398878838440 has 32 divisors (see below), whose sum is σ = 899922862080. Its totient is φ = 159116784192.

The previous prime is 398878838431. The next prime is 398878838443. The reversal of 398878838440 is 44838878893.

It is a self number, because there is not a number n which added to its sum of digits gives 398878838440.

It is not an unprimeable number, because it can be changed into a prime (398878838443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13571112 + ... + 13600471.

It is an arithmetic number, because the mean of its divisors is an integer number (28122589440).

Almost surely, 2^398878838440 is an apocalyptic number.

It is an amenable number.

398878838440 is an abundant number, since it is smaller than the sum of its proper divisors (501044023640).

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

398878838440 is a wasteful number, since it uses less digits than its factorization.

398878838440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27171961 (or 27171957 counting only the distinct ones).

The product of its (nonzero) digits is 297271296, while the sum is 70.

The spelling of 398878838440 in words is "three hundred ninety-eight billion, eight hundred seventy-eight million, eight hundred thirty-eight thousand, four hundred forty".