40402340442 has 12 divisors (see below), whose sum is σ = 87538404330. Its totient is φ = 13467446808.

The previous prime is 40402340413. The next prime is 40402340443. The reversal of 40402340442 is 24404320404.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 35378224281 + 5024116161 = 188091^2 + 70881^2 .

It is a super-2 number, since 2×40402340442² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40402340443) 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, 1122287217 + ... + 1122287252.

Almost surely, 2^40402340442 is an apocalyptic number.

40402340442 is an abundant number, since it is smaller than the sum of its proper divisors (47136063888).

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

40402340442 is a wasteful number, since it uses less digits than its factorization.

40402340442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244574477 (or 2244574474 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 27.

Adding to 40402340442 its reverse (24404320404), we get a palindrome (64806660846).

The spelling of 40402340442 in words is "forty billion, four hundred two million, three hundred forty thousand, four hundred forty-two".