646842469 has 32 divisors (see below), whose sum is σ = 845703936. Its totient is φ = 480107520.

The previous prime is 646842461. The next prime is 646842541. The reversal of 646842469 is 964248646.

It is a cyclic number.

It is not a de Polignac number, because 646842469 - 2³ = 646842461 is a prime.

It is a super-2 number, since 2×646842469² = 836810359404031922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646842461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 712714 + ... + 713620.

It is an arithmetic number, because the mean of its divisors is an integer number (26428248).

Almost surely, 2^646842469 is an apocalyptic number.

It is an amenable number.

646842469 is a deficient number, since it is larger than the sum of its proper divisors (198861467).

646842469 is a wasteful number, since it uses less digits than its factorization.

646842469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405.

The product of its digits is 1990656, while the sum is 49.

The square root of 646842469 is about 25433.0979041091. The cubic root of 646842469 is about 864.8341731635.

The spelling of 646842469 in words is "six hundred forty-six million, eight hundred forty-two thousand, four hundred sixty-nine".