3999999942 has 32 divisors (see below), whose sum is σ = 8952854400. Its totient is φ = 1323738504.

The previous prime is 3999999937. The next prime is 3999999979. The reversal of 3999999942 is 2499999993.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258948 + ... + 273959.

It is an arithmetic number, because the mean of its divisors is an integer number (279776700).

Almost surely, 2^3999999942 is an apocalyptic number.

3999999942 is an abundant number, since it is smaller than the sum of its proper divisors (4952854458).

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

3999999942 is a wasteful number, since it uses less digits than its factorization.

3999999942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533057 (or 533051 counting only the distinct ones).

The product of its digits is 114791256, while the sum is 72.

The square root of 3999999942 is about 63245.5527448373. The cubic root of 3999999942 is about 1587.4010442958.

The spelling of 3999999942 in words is "three billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty-two".