402240312 has 24 divisors (see below), whose sum is σ = 1089401040. Its totient is φ = 134080080.

The previous prime is 402240269. The next prime is 402240341. The reversal of 402240312 is 213042204.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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, 2793264 + ... + 2793407.

It is an arithmetic number, because the mean of its divisors is an integer number (45391710).

Almost surely, 2^402240312 is an apocalyptic number.

It is an amenable number.

402240312 is an abundant number, since it is smaller than the sum of its proper divisors (687160728).

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

402240312 is a wasteful number, since it uses less digits than its factorization.

402240312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5586683 (or 5586676 counting only the distinct ones).

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

The square root of 402240312 is about 20055.9295970045. The cubic root of 402240312 is about 738.1793029423.

Adding to 402240312 its reverse (213042204), we get a palindrome (615282516).

The spelling of 402240312 in words is "four hundred two million, two hundred forty thousand, three hundred twelve".