43139994 has 32 divisors (see below), whose sum is σ = 93960000. Its totient is φ = 13152384.

The previous prime is 43139983. The next prime is 43140001. The reversal of 43139994 is 49993134.

It is a super-2 number, since 2×43139994² = 3722118164640072, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3219 + ... + 9830.

It is an arithmetic number, because the mean of its divisors is an integer number (2936250).

Almost surely, 2^43139994 is an apocalyptic number.

43139994 is an abundant number, since it is smaller than the sum of its proper divisors (50820006).

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

43139994 is a wasteful number, since it uses less digits than its factorization.

43139994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13102.

The product of its digits is 104976, while the sum is 42.

The square root of 43139994 is about 6568.1042927164. The cubic root of 43139994 is about 350.7195916317.

The spelling of 43139994 in words is "forty-three million, one hundred thirty-nine thousand, nine hundred ninety-four".