42999978 has 32 divisors (see below), whose sum is σ = 98803584. Its totient is φ = 12220992.

The previous prime is 42999977. The next prime is 43000019. The reversal of 42999978 is 87999924.

It is not an unprimeable number, because it can be changed into a prime (42999973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5676 + ... + 10872.

It is an arithmetic number, because the mean of its divisors is an integer number (3087612).

Almost surely, 2^42999978 is an apocalyptic number.

42999978 is an abundant number, since it is smaller than the sum of its proper divisors (55803606).

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

42999978 is a wasteful number, since it uses less digits than its factorization.

42999978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5406.

The product of its digits is 2939328, while the sum is 57.

The square root of 42999978 is about 6557.4368468175. The cubic root of 42999978 is about 350.3397462908.

The spelling of 42999978 in words is "forty-two million, nine hundred ninety-nine thousand, nine hundred seventy-eight".