399981980016 has 100 divisors (see below), whose sum is σ = 1184586475512. Its totient is φ = 130226673024.

The previous prime is 399981980011. The next prime is 399981980053. The reversal of 399981980016 is 610089189993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399981980011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3532971 + ... + 3644426.

Almost surely, 2^399981980016 is an apocalyptic number.

399981980016 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

399981980016 is an abundant number, since it is smaller than the sum of its proper divisors (784604495496).

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

399981980016 is a wasteful number, since it uses less digits than its factorization.

399981980016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7177460 (or 7177445 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 63.

The spelling of 399981980016 in words is "three hundred ninety-nine billion, nine hundred eighty-one million, nine hundred eighty thousand, sixteen".