40207979 has 12 divisors (see below), whose sum is σ = 48807504. Its totient is φ = 32964624.

The previous prime is 40207943. The next prime is 40207987. The reversal of 40207979 is 97970204.

It is a happy number.

40207979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40207979 - 2²⁰ = 39159403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40201979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16712 + ... + 18965.

It is an arithmetic number, because the mean of its divisors is an integer number (4067292).

Almost surely, 2^40207979 is an apocalyptic number.

40207979 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

40207979 is a deficient number, since it is larger than the sum of its proper divisors (8599525).

40207979 is a wasteful number, since it uses less digits than its factorization.

40207979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35714 (or 35707 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 40207979 is about 6340.9761866766. The cubic root of 40207979 is about 342.5868968068.

The spelling of 40207979 in words is "forty million, two hundred seven thousand, nine hundred seventy-nine".