402312040 has 64 divisors (see below), whose sum is σ = 985899600. Its totient is φ = 146860032.

The previous prime is 402312037. The next prime is 402312047. The reversal of 402312040 is 40213204.

It can be written as a sum of positive squares in 8 ways, for example, as 2232036 + 400080004 = 1494^2 + 20002^2 .

It is not an unprimeable number, because it can be changed into a prime (402312047) 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, 41934 + ... + 50626.

Almost surely, 2^402312040 is an apocalyptic number.

402312040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402312040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (492949800).

402312040 is an abundant number, since it is smaller than the sum of its proper divisors (583587560).

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

402312040 is a wasteful number, since it uses less digits than its factorization.

402312040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8806 (or 8802 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 402312040 is about 20057.7177166297. The cubic root of 402312040 is about 738.2231780227.

Adding to 402312040 its reverse (40213204), we get a palindrome (442525244).

The spelling of 402312040 in words is "four hundred two million, three hundred twelve thousand, forty".