400239942 has 32 divisors (see below), whose sum is σ = 857109600. Its totient is φ = 124151808.

The previous prime is 400239937. The next prime is 400239949. The reversal of 400239942 is 249932004.

It is a super-2 number, since 2×400239942² = 320384022344326728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400239949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12967 + ... + 31122.

It is an arithmetic number, because the mean of its divisors is an integer number (26784675).

Almost surely, 2^400239942 is an apocalyptic number.

400239942 is an abundant number, since it is smaller than the sum of its proper divisors (456869658).

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

400239942 is a wasteful number, since it uses less digits than its factorization.

400239942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44200.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 400239942 is about 20005.9976507047. The cubic root of 400239942 is about 736.9535959275.

The spelling of 400239942 in words is "four hundred million, two hundred thirty-nine thousand, nine hundred forty-two".