408164581 has 12 divisors (see below), whose sum is σ = 449267616. Its totient is φ = 370542920.

The previous prime is 408164579. The next prime is 408164597. The reversal of 408164581 is 185461804.

It is not a de Polignac number, because 408164581 - 2¹ = 408164579 is a prime.

It is a super-2 number, since 2×408164581² = 333196650365811122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 408164581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408162581) 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, 105426 + ... + 109228.

It is an arithmetic number, because the mean of its divisors is an integer number (37438968).

Almost surely, 2^408164581 is an apocalyptic number.

It is an amenable number.

408164581 is a deficient number, since it is larger than the sum of its proper divisors (41103035).

408164581 is a wasteful number, since it uses less digits than its factorization.

408164581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4712 (or 4701 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 408164581 is about 20203.0834527802. The cubic root of 408164581 is about 741.7856687276.

The spelling of 408164581 in words is "four hundred eight million, one hundred sixty-four thousand, five hundred eighty-one".