406724661 has 12 divisors (see below), whose sum is σ = 671418592. Its totient is φ = 232414056.

The previous prime is 406724657. The next prime is 406724713. The reversal of 406724661 is 166427604.

406724661 is a `hidden beast` number, since 406 + 7 + 246 + 6 + 1 = 666.

It is not a de Polignac number, because 406724661 - 2² = 406724657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406724161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3227911 + ... + 3228036.

Almost surely, 2^406724661 is an apocalyptic number.

It is an amenable number.

406724661 is a deficient number, since it is larger than the sum of its proper divisors (264693931).

406724661 is a wasteful number, since it uses less digits than its factorization.

406724661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6455960 (or 6455957 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 406724661 is about 20167.4158235506. The cubic root of 406724661 is about 740.9123522900.

The spelling of 406724661 in words is "four hundred six million, seven hundred twenty-four thousand, six hundred sixty-one".