40556281 has 4 divisors (see below), whose sum is σ = 40580352. Its totient is φ = 40532212.

The previous prime is 40556251. The next prime is 40556303. The reversal of 40556281 is 18265504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40556281 - 2⁵ = 40556249 is a prime.

It is a super-2 number, since 2×40556281² = 3289623857101922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40556231) 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, 9301 + ... + 12946.

It is an arithmetic number, because the mean of its divisors is an integer number (10145088).

Almost surely, 2^40556281 is an apocalyptic number.

It is an amenable number.

40556281 is a deficient number, since it is larger than the sum of its proper divisors (24071).

40556281 is a wasteful number, since it uses less digits than its factorization.

40556281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24070.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 40556281 is about 6368.3813485061. The cubic root of 40556281 is about 343.5732748454.

The spelling of 40556281 in words is "forty million, five hundred fifty-six thousand, two hundred eighty-one".