40208979 has 4 divisors (see below), whose sum is σ = 53611976. Its totient is φ = 26805984.

The previous prime is 40208977. The next prime is 40208983. The reversal of 40208979 is 97980204.

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

It is not a de Polignac number, because 40208979 - 2¹ = 40208977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40208977) 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, 6701494 + ... + 6701499.

It is an arithmetic number, because the mean of its divisors is an integer number (13402994).

Almost surely, 2^40208979 is an apocalyptic number.

40208979 is a deficient number, since it is larger than the sum of its proper divisors (13402997).

40208979 is a wasteful number, since it uses less digits than its factorization.

40208979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13402996.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 40208979 is about 6341.0550383986. The cubic root of 40208979 is about 342.5897369069.

The spelling of 40208979 in words is "forty million, two hundred eight thousand, nine hundred seventy-nine".