40402252420 has 12 divisors (see below), whose sum is σ = 84844730124. Its totient is φ = 16160900960.

The previous prime is 40402252391. The next prime is 40402252421. The reversal of 40402252420 is 2425220404.

It can be written as a sum of positive squares in 2 ways, for example, as 8580687424 + 31821564996 = 92632^2 + 178386^2 .

It is not an unprimeable number, because it can be changed into a prime (40402252421) 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, 1010056291 + ... + 1010056330.

It is an arithmetic number, because the mean of its divisors is an integer number (7070394177).

Almost surely, 2^40402252420 is an apocalyptic number.

It is an amenable number.

40402252420 is an abundant number, since it is smaller than the sum of its proper divisors (44442477704).

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

40402252420 is a wasteful number, since it uses less digits than its factorization.

40402252420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2020112630 (or 2020112628 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 25.

Adding to 40402252420 its reverse (2425220404), we get a palindrome (42827472824).

The spelling of 40402252420 in words is "forty billion, four hundred two million, two hundred fifty-two thousand, four hundred twenty".