40490621 has 4 divisors (see below), whose sum is σ = 40595100. Its totient is φ = 40386144.

The previous prime is 40490587. The next prime is 40490629. The reversal of 40490621 is 12609404.

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 22934521 + 17556100 = 4789^2 + 4190^2 .

It is a cyclic number.

It is not a de Polignac number, because 40490621 - 2²² = 36296317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40490629) 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, 51656 + ... + 52433.

It is an arithmetic number, because the mean of its divisors is an integer number (10148775).

Almost surely, 2^40490621 is an apocalyptic number.

It is an amenable number.

40490621 is a deficient number, since it is larger than the sum of its proper divisors (104479).

40490621 is a wasteful number, since it uses less digits than its factorization.

40490621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104478.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 40490621 is about 6363.2241041786. The cubic root of 40490621 is about 343.3877613987.

The spelling of 40490621 in words is "forty million, four hundred ninety thousand, six hundred twenty-one".