40440402 has 12 divisors (see below), whose sum is σ = 87620910. Its totient is φ = 13480128.

The previous prime is 40440401. The next prime is 40440403. The reversal of 40440402 is 20404404.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (40440401) and next prime (40440403).

It can be written as a sum of positive squares in only one way, i.e., 23126481 + 17313921 = 4809^2 + 4161^2 .

It is a super-2 number, since 2×40440402² = 3270852227843208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 2246689 = 40440402 / (4 + 0 + 4 + 4 + 0 + 4 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (40440401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1123327 + ... + 1123362.

Almost surely, 2^40440402 is an apocalyptic number.

40440402 is an abundant number, since it is smaller than the sum of its proper divisors (47180508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40440402 is a wasteful number, since it uses less digits than its factorization.

40440402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246697 (or 2246694 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 40440402 is about 6359.2768456799. The cubic root of 40440402 is about 343.2457390097.

Adding to 40440402 its reverse (20404404), we get a palindrome (60844806).

The spelling of 40440402 in words is "forty million, four hundred forty thousand, four hundred two".