402013242 has 12 divisors (see below), whose sum is σ = 871028730. Its totient is φ = 134004408.

The previous prime is 402013219. The next prime is 402013253. The reversal of 402013242 is 242310204.

It can be written as a sum of positive squares in only one way, i.e., 387656721 + 14356521 = 19689^2 + 3789^2 .

It is a super-2 number, since 2×402013242² = 323229293486701128, 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: 22334069 = 402013242 / (4 + 0 + 2 + 0 + 1 + 3 + 2 + 4 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11167017 + ... + 11167052.

Almost surely, 2^402013242 is an apocalyptic number.

402013242 is an abundant number, since it is smaller than the sum of its proper divisors (469015488).

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

402013242 is a wasteful number, since it uses less digits than its factorization.

402013242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22334077 (or 22334074 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 402013242 is about 20050.2678785098. The cubic root of 402013242 is about 738.0403727886.

Adding to 402013242 its reverse (242310204), we get a palindrome (644323446).

The spelling of 402013242 in words is "four hundred two million, thirteen thousand, two hundred forty-two".