40207978 has 16 divisors (see below), whose sum is σ = 62818560. Its totient is φ = 19278000.

The previous prime is 40207943. The next prime is 40207987. The reversal of 40207978 is 87970204.

It is a happy number.

It is a zygodrome in base 7.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6463 + ... + 11053.

It is an arithmetic number, because the mean of its divisors is an integer number (3926160).

Almost surely, 2^40207978 is an apocalyptic number.

40207978 is a deficient number, since it is larger than the sum of its proper divisors (22610582).

40207978 is a wasteful number, since it uses less digits than its factorization.

40207978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4773.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 40207978 is about 6340.9761078244. The cubic root of 40207978 is about 342.5868939667.

The spelling of 40207978 in words is "forty million, two hundred seven thousand, nine hundred seventy-eight".