40455521 has 4 divisors (see below), whose sum is σ = 40509444. Its totient is φ = 40401600.

The previous prime is 40455517. The next prime is 40455553. The reversal of 40455521 is 12555404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9541921 + 30913600 = 3089^2 + 5560^2 .

It is a cyclic number.

It is not a de Polignac number, because 40455521 - 2² = 40455517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40455581) 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, 25820 + ... + 27341.

It is an arithmetic number, because the mean of its divisors is an integer number (10127361).

Almost surely, 2^40455521 is an apocalyptic number.

It is an amenable number.

40455521 is a deficient number, since it is larger than the sum of its proper divisors (53923).

40455521 is an equidigital number, since it uses as much as digits as its factorization.

40455521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53922.

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 40455521 is about 6360.4654703882. The cubic root of 40455521 is about 343.2885088264.

The spelling of 40455521 in words is "forty million, four hundred fifty-five thousand, five hundred twenty-one".