40089978 has 40 divisors (see below), whose sum is σ = 95121972. Its totient is φ = 12576384.

The previous prime is 40089953. The next prime is 40089991. The reversal of 40089978 is 87998004.

It can be written as a sum of positive squares in 2 ways, for example, as 40030929 + 59049 = 6327^2 + 243^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4525 + ... + 10032.

Almost surely, 2^40089978 is an apocalyptic number.

40089978 is an abundant number, since it is smaller than the sum of its proper divisors (55031994).

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

40089978 is a wasteful number, since it uses less digits than its factorization.

40089978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14588 (or 14579 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 40089978 is about 6331.6647100111. The cubic root of 40089978 is about 342.2514309899.

The spelling of 40089978 in words is "forty million, eighty-nine thousand, nine hundred seventy-eight".