402344240 has 20 divisors (see below), whose sum is σ = 935450544. Its totient is φ = 160937664.

The previous prime is 402344237. The next prime is 402344251. The reversal of 402344240 is 42443204.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×402344240² = 323761774922355200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2514572 + ... + 2514731.

Almost surely, 2^402344240 is an apocalyptic number.

402344240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402344240 is an abundant number, since it is smaller than the sum of its proper divisors (533106304).

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

402344240 is a wasteful number, since it uses less digits than its factorization.

402344240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5029316 (or 5029310 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 23.

The square root of 402344240 is about 20058.5203841161. The cubic root of 402344240 is about 738.2428726460.

Adding to 402344240 its reverse (42443204), we get a palindrome (444787444).

The spelling of 402344240 in words is "four hundred two million, three hundred forty-four thousand, two hundred forty".