40044139 has 2 divisors, whose sum is σ = 40044140. Its totient is φ = 40044138.

The previous prime is 40044131. The next prime is 40044209. The reversal of 40044139 is 93144004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40044139 - 2³ = 40044131 is a prime.

It is not a weakly prime, because it can be changed into another prime (40044131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20022069 + 20022070.

It is an arithmetic number, because the mean of its divisors is an integer number (20022070).

Almost surely, 2^40044139 is an apocalyptic number.

40044139 is a deficient number, since it is larger than the sum of its proper divisors (1).

40044139 is an equidigital number, since it uses as much as digits as its factorization.

40044139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 40044139 is about 6328.0438525661. The cubic root of 40044139 is about 342.1209374739.

It can be divided in two parts, 40044 and 139, that multiplied together give a triangular number (5566116 = T₃₃₃₆).

The spelling of 40044139 in words is "forty million, forty-four thousand, one hundred thirty-nine".