406538239 has 4 divisors (see below), whose sum is σ = 406911960. Its totient is φ = 406164520.

The previous prime is 406538227. The next prime is 406538291. The reversal of 406538239 is 932835604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 406538239 - 2¹¹ = 406536191 is a prime.

It is a super-2 number, since 2×406538239² = 330546679538442242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406530239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185224 + ... + 187405.

It is an arithmetic number, because the mean of its divisors is an integer number (101727990).

Almost surely, 2^406538239 is an apocalyptic number.

406538239 is a deficient number, since it is larger than the sum of its proper divisors (373721).

406538239 is a wasteful number, since it uses less digits than its factorization.

406538239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373720.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 406538239 is about 20162.7934324587. The cubic root of 406538239 is about 740.7991360827.

The spelling of 406538239 in words is "four hundred six million, five hundred thirty-eight thousand, two hundred thirty-nine".