40528421 has 4 divisors (see below), whose sum is σ = 40583712. Its totient is φ = 40473132.

The previous prime is 40528417. The next prime is 40528441. The reversal of 40528421 is 12482504.

It is a happy number.

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 40528421 - 2² = 40528417 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 (40528441) 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, 26531 + ... + 28016.

It is an arithmetic number, because the mean of its divisors is an integer number (10145928).

Almost surely, 2^40528421 is an apocalyptic number.

It is an amenable number.

40528421 is a deficient number, since it is larger than the sum of its proper divisors (55291).

40528421 is an equidigital number, since it uses as much as digits as its factorization.

40528421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55290.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 40528421 is about 6366.1936037164. The cubic root of 40528421 is about 343.4945846578.

The spelling of 40528421 in words is "forty million, five hundred twenty-eight thousand, four hundred twenty-one".