42990978 has 16 divisors (see below), whose sum is σ = 86162976. Its totient is φ = 14300160.

The previous prime is 42990971. The next prime is 42990989. The reversal of 42990978 is 87909924.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (42990971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4351 + ... + 10242.

It is an arithmetic number, because the mean of its divisors is an integer number (5385186).

Almost surely, 2^42990978 is an apocalyptic number.

42990978 is an abundant number, since it is smaller than the sum of its proper divisors (43171998).

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

42990978 is a wasteful number, since it uses less digits than its factorization.

42990978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15089.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 42990978 is about 6556.7505671636. The cubic root of 42990978 is about 350.3153022649.

The spelling of 42990978 in words is "forty-two million, nine hundred ninety thousand, nine hundred seventy-eight".