40236139 has 2 divisors, whose sum is σ = 40236140. Its totient is φ = 40236138.

The previous prime is 40236121. The next prime is 40236179. The reversal of 40236139 is 93163204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40236139 - 2⁷ = 40236011 is a prime.

It is not a weakly prime, because it can be changed into another prime (40236179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20118069 + 20118070.

It is an arithmetic number, because the mean of its divisors is an integer number (20118070).

Almost surely, 2^40236139 is an apocalyptic number.

40236139 is a deficient number, since it is larger than the sum of its proper divisors (1).

40236139 is an equidigital number, since it uses as much as digits as its factorization.

40236139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 40236139 is about 6343.1962763263. The cubic root of 40236139 is about 342.6668560251. Note that the first 3 decimals are identical.

The spelling of 40236139 in words is "forty million, two hundred thirty-six thousand, one hundred thirty-nine".