626946409 has 4 divisors (see below), whose sum is σ = 627508804. Its totient is φ = 626384016.

The previous prime is 626946377. The next prime is 626946421. The reversal of 626946409 is 904649626.

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

It can be written as a sum of positive squares in 2 ways, for example, as 322094809 + 304851600 = 17947^2 + 17460^2 .

It is a cyclic number.

It is not a de Polignac number, because 626946409 - 2⁵ = 626946377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (626946469) 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, 279522 + ... + 281755.

It is an arithmetic number, because the mean of its divisors is an integer number (156877201).

Almost surely, 2^626946409 is an apocalyptic number.

It is an amenable number.

626946409 is a deficient number, since it is larger than the sum of its proper divisors (562395).

626946409 is a wasteful number, since it uses less digits than its factorization.

626946409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562394.

The product of its (nonzero) digits is 559872, while the sum is 46.

The square root of 626946409 is about 25038.8979190379. The cubic root of 626946409 is about 855.8746035962.

The spelling of 626946409 in words is "six hundred twenty-six million, nine hundred forty-six thousand, four hundred nine".