40559978 has 4 divisors (see below), whose sum is σ = 60839970. Its totient is φ = 20279988.

The previous prime is 40559929. The next prime is 40559989. The reversal of 40559978 is 87995504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26142769 + 14417209 = 5113^2 + 3797^2 .

It is a super-2 number, since 2×40559978² = 3290223630720968, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10139993 + ... + 10139996.

Almost surely, 2^40559978 is an apocalyptic number.

40559978 is a deficient number, since it is larger than the sum of its proper divisors (20279992).

40559978 is a wasteful number, since it uses less digits than its factorization.

40559978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20279991.

The product of its (nonzero) digits is 453600, while the sum is 47.

The square root of 40559978 is about 6368.6716040317. The cubic root of 40559978 is about 343.5837142626.

The spelling of 40559978 in words is "forty million, five hundred fifty-nine thousand, nine hundred seventy-eight".