40402404 has 72 divisors (see below), whose sum is σ = 123596928. Its totient is φ = 10863360.

The previous prime is 40402403. The next prime is 40402441. The reversal of 40402404 is 40420404.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (40402403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 432 + ... + 8999.

It is an arithmetic number, because the mean of its divisors is an integer number (1716624).

Almost surely, 2^40402404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40402404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61798464).

40402404 is an abundant number, since it is smaller than the sum of its proper divisors (83194524).

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

40402404 is a wasteful number, since it uses less digits than its factorization.

40402404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9465 (or 9460 counting only the distinct ones).

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

The square root of 40402404 is about 6356.2885397062. The cubic root of 40402404 is about 343.1382001949.

Adding to 40402404 its reverse (40420404), we get a palindrome (80822808).

The spelling of 40402404 in words is "forty million, four hundred two thousand, four hundred four".