398040767988 has 12 divisors (see below), whose sum is σ = 928761792000. Its totient is φ = 132680255992.

The previous prime is 398040767977. The next prime is 398040767989. The reversal of 398040767988 is 889767040893.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398040767989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16585031988 + ... + 16585032011.

It is an arithmetic number, because the mean of its divisors is an integer number (77396816000).

Almost surely, 2^398040767988 is an apocalyptic number.

It is an amenable number.

398040767988 is an abundant number, since it is smaller than the sum of its proper divisors (530721024012).

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

398040767988 is a wasteful number, since it uses less digits than its factorization.

398040767988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33170064006 (or 33170064004 counting only the distinct ones).

The product of its (nonzero) digits is 146313216, while the sum is 69.

The spelling of 398040767988 in words is "three hundred ninety-eight billion, forty million, seven hundred sixty-seven thousand, nine hundred eighty-eight".