406023139 has 2 divisors, whose sum is σ = 406023140. Its totient is φ = 406023138.

The previous prime is 406023133. The next prime is 406023169. The reversal of 406023139 is 931320604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 406023139 - 2⁷ = 406023011 is a prime.

It is not a weakly prime, because it can be changed into another prime (406023133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203011569 + 203011570.

It is an arithmetic number, because the mean of its divisors is an integer number (203011570).

Almost surely, 2^406023139 is an apocalyptic number.

406023139 is a deficient number, since it is larger than the sum of its proper divisors (1).

406023139 is an equidigital number, since it uses as much as digits as its factorization.

406023139 is an evil number, because the sum of its binary digits is even.

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

The square root of 406023139 is about 20150.0158560732. The cubic root of 406023139 is about 740.4861299304.

The spelling of 406023139 in words is "four hundred six million, twenty-three thousand, one hundred thirty-nine".