406073639 has 4 divisors (see below), whose sum is σ = 415517256. Its totient is φ = 396630024.

The previous prime is 406073593. The next prime is 406073641. The reversal of 406073639 is 936370604.

It is a happy number.

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 406073639 - 2²⁰ = 405025063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406073659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4721744 + ... + 4721829.

It is an arithmetic number, because the mean of its divisors is an integer number (103879314).

Almost surely, 2^406073639 is an apocalyptic number.

406073639 is a deficient number, since it is larger than the sum of its proper divisors (9443617).

406073639 is an equidigital number, since it uses as much as digits as its factorization.

406073639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9443616.

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 406073639 is about 20151.2689178622. The cubic root of 406073639 is about 740.5168285086.

The spelling of 406073639 in words is "four hundred six million, seventy-three thousand, six hundred thirty-nine".