1304312440 has 32 divisors (see below), whose sum is σ = 2964966480. Its totient is φ = 516344832.

The previous prime is 1304312417. The next prime is 1304312447. The reversal of 1304312440 is 442134031.

It is a super-2 number, since 2×1304312440² = 3402461882277507200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1304312447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164202 + ... + 171961.

Almost surely, 2^1304312440 is an apocalyptic number.

1304312440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1304312440 is an abundant number, since it is smaller than the sum of its proper divisors (1660654040).

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

1304312440 is a wasteful number, since it uses less digits than its factorization.

1304312440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336271 (or 336267 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1304312440 is about 36115.2660242175. The cubic root of 1304312440 is about 1092.5983629562.

Adding to 1304312440 its reverse (442134031), we get a palindrome (1746446471).

The spelling of 1304312440 in words is "one billion, three hundred four million, three hundred twelve thousand, four hundred forty".