406647644 has 12 divisors (see below), whose sum is σ = 766374504. Its totient is φ = 187683504.

The previous prime is 406647643. The next prime is 406647679. The reversal of 406647644 is 446746604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406647643) 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, 3910022 + ... + 3910125.

It is an arithmetic number, because the mean of its divisors is an integer number (63864542).

Almost surely, 2^406647644 is an apocalyptic number.

It is an amenable number.

406647644 is a deficient number, since it is larger than the sum of its proper divisors (359726860).

406647644 is a wasteful number, since it uses less digits than its factorization.

406647644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7820164 (or 7820162 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 41.

The square root of 406647644 is about 20165.5062916853. The cubic root of 406647644 is about 740.8655831820.

The spelling of 406647644 in words is "four hundred six million, six hundred forty-seven thousand, six hundred forty-four".