4056391998 has 24 divisors (see below), whose sum is σ = 9305841168. Its totient is φ = 1272593472.

The previous prime is 4056391993. The next prime is 4056392009. The reversal of 4056391998 is 8991936504.

4056391998 is a `hidden beast` number, since 405 + 63 + 91 + 9 + 98 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4056391991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6627786 + ... + 6628397.

It is an arithmetic number, because the mean of its divisors is an integer number (387743382).

Almost surely, 2^4056391998 is an apocalyptic number.

4056391998 is an abundant number, since it is smaller than the sum of its proper divisors (5249449170).

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

4056391998 is a wasteful number, since it uses less digits than its factorization.

4056391998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13256208 (or 13256205 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 54.

The square root of 4056391998 is about 63689.8107863416. The cubic root of 4056391998 is about 1594.8259946510.

The spelling of 4056391998 in words is "four billion, fifty-six million, three hundred ninety-one thousand, nine hundred ninety-eight".