408472661 has 2 divisors, whose sum is σ = 408472662. Its totient is φ = 408472660.

The previous prime is 408472657. The next prime is 408472679. The reversal of 408472661 is 166274804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 408444100 + 28561 = 20210^2 + 169^2 .

It is a cyclic number.

It is not a de Polignac number, because 408472661 - 2² = 408472657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408472601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204236330 + 204236331.

It is an arithmetic number, because the mean of its divisors is an integer number (204236331).

Almost surely, 2^408472661 is an apocalyptic number.

It is an amenable number.

408472661 is a deficient number, since it is larger than the sum of its proper divisors (1).

408472661 is an equidigital number, since it uses as much as digits as its factorization.

408472661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 408472661 is about 20210.7065932886. The cubic root of 408472661 is about 741.9722534748.

The spelling of 408472661 in words is "four hundred eight million, four hundred seventy-two thousand, six hundred sixty-one".