40615139 has 2 divisors, whose sum is σ = 40615140. Its totient is φ = 40615138.

The previous prime is 40615123. The next prime is 40615147. The reversal of 40615139 is 93151604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40615139 - 2⁴ = 40615123 is a prime.

It is not a weakly prime, because it can be changed into another prime (40615339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20307569 + 20307570.

It is an arithmetic number, because the mean of its divisors is an integer number (20307570).

Almost surely, 2^40615139 is an apocalyptic number.

40615139 is a deficient number, since it is larger than the sum of its proper divisors (1).

40615139 is an equidigital number, since it uses as much as digits as its factorization.

40615139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 40615139 is about 6373.0007845598. Note that the first 3 decimals coincide. The cubic root of 40615139 is about 343.7394000478.

The spelling of 40615139 in words is "forty million, six hundred fifteen thousand, one hundred thirty-nine".