40402421 has 16 divisors (see below), whose sum is σ = 44955648. Its totient is φ = 36115200.

The previous prime is 40402403. The next prime is 40402441. The reversal of 40402421 is 12420404.

It is a cyclic number.

It is not a de Polignac number, because 40402421 - 2⁶ = 40402357 is a prime.

It is a super-2 number, since 2×40402421² = 3264711245322482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40402421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40402441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74411 + ... + 74951.

It is an arithmetic number, because the mean of its divisors is an integer number (2809728).

Almost surely, 2^40402421 is an apocalyptic number.

It is an amenable number.

40402421 is a deficient number, since it is larger than the sum of its proper divisors (4553227).

40402421 is a wasteful number, since it uses less digits than its factorization.

40402421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 40402421 is about 6356.2898769644. The cubic root of 40402421 is about 343.1382483220.

Adding to 40402421 its reverse (12420404), we get a palindrome (52822825).

The spelling of 40402421 in words is "forty million, four hundred two thousand, four hundred twenty-one".