40355281 has 4 divisors (see below), whose sum is σ = 41213952. Its totient is φ = 39496612.

The previous prime is 40355279. The next prime is 40355291. The reversal of 40355281 is 18255304.

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 40355281 - 2¹ = 40355279 is a prime.

It is a super-2 number, since 2×40355281² = 3257097409177922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40355261) 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, 429265 + ... + 429358.

It is an arithmetic number, because the mean of its divisors is an integer number (10303488).

Almost surely, 2^40355281 is an apocalyptic number.

It is an amenable number.

40355281 is a deficient number, since it is larger than the sum of its proper divisors (858671).

40355281 is an equidigital number, since it uses as much as digits as its factorization.

40355281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858670.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 40355281 is about 6352.5806567095. The cubic root of 40355281 is about 343.0047428562.

It can be divided in two parts, 4035 and 5281, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 40355281 in words is "forty million, three hundred fifty-five thousand, two hundred eighty-one".