40452421 has 4 divisors (see below), whose sum is σ = 40771072. Its totient is φ = 40133772.

The previous prime is 40452413. The next prime is 40452431. The reversal of 40452421 is 12425404.

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 40452421 - 2³ = 40452413 is a prime.

It is a super-2 number, since 2×40452421² = 3272796729522482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40452392 and 40452401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40452431) 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, 159135 + ... + 159388.

It is an arithmetic number, because the mean of its divisors is an integer number (10192768).

Almost surely, 2^40452421 is an apocalyptic number.

It is an amenable number.

40452421 is a deficient number, since it is larger than the sum of its proper divisors (318651).

40452421 is a wasteful number, since it uses less digits than its factorization.

40452421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318650.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 40452421 is about 6360.2217728630. The cubic root of 40452421 is about 343.2797401711.

Adding to 40452421 its reverse (12425404), we get a palindrome (52877825).

It can be divided in two parts, 404 and 52421, that added together give a palindrome (52825).

The spelling of 40452421 in words is "forty million, four hundred fifty-two thousand, four hundred twenty-one".