40204139 has 2 divisors, whose sum is σ = 40204140. Its totient is φ = 40204138.

The previous prime is 40204123. The next prime is 40204141. The reversal of 40204139 is 93140204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40204139 - 2⁴ = 40204123 is a prime.

Together with 40204141, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40204189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20102069 + 20102070.

It is an arithmetic number, because the mean of its divisors is an integer number (20102070).

Almost surely, 2^40204139 is an apocalyptic number.

40204139 is a deficient number, since it is larger than the sum of its proper divisors (1).

40204139 is an equidigital number, since it uses as much as digits as its factorization.

40204139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 40204139 is about 6340.6733869519. The cubic root of 40204139 is about 342.5759903848.

The spelling of 40204139 in words is "forty million, two hundred four thousand, one hundred thirty-nine".