42989978 has 8 divisors (see below), whose sum is σ = 64819668. Its totient is φ = 21383424.

The previous prime is 42989971. The next prime is 42989987. The reversal of 42989978 is 87998924.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 41434969 + 1555009 = 6437^2 + 1247^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (42989971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55301 + ... + 56072.

Almost surely, 2^42989978 is an apocalyptic number.

42989978 is a deficient number, since it is larger than the sum of its proper divisors (21829690).

42989978 is a wasteful number, since it uses less digits than its factorization.

42989978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111568.

The product of its digits is 2612736, while the sum is 56.

The square root of 42989978 is about 6556.6743094346. The cubic root of 42989978 is about 350.3125860515.

The spelling of 42989978 in words is "forty-two million, nine hundred eighty-nine thousand, nine hundred seventy-eight".