406252581 has 12 divisors (see below), whose sum is σ = 630106272. Its totient is φ = 232144248.

The previous prime is 406252573. The next prime is 406252591. The reversal of 406252581 is 185252604.

It is not a de Polignac number, because 406252581 - 2³ = 406252573 is a prime.

It is a super-2 number, since 2×406252581² = 330082319138323122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406252501) 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, 1381665 + ... + 1381958.

It is an arithmetic number, because the mean of its divisors is an integer number (52508856).

Almost surely, 2^406252581 is an apocalyptic number.

It is an amenable number.

406252581 is a deficient number, since it is larger than the sum of its proper divisors (223853691).

406252581 is a wasteful number, since it uses less digits than its factorization.

406252581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763640 (or 2763633 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 406252581 is about 20155.7083973747. The cubic root of 406252581 is about 740.6255855503.

The spelling of 406252581 in words is "four hundred six million, two hundred fifty-two thousand, five hundred eighty-one".