1312240398 has 16 divisors (see below), whose sum is σ = 2999406720. Its totient is φ = 374925816.

The previous prime is 1312240381. The next prime is 1312240399. The reversal of 1312240398 is 8930422131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312240399) 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, 15621868 + ... + 15621951.

It is an arithmetic number, because the mean of its divisors is an integer number (187462920).

Almost surely, 2^1312240398 is an apocalyptic number.

1312240398 is an abundant number, since it is smaller than the sum of its proper divisors (1687166322).

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

1312240398 is a wasteful number, since it uses less digits than its factorization.

1312240398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31243831.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1312240398 is about 36224.8588403047. The cubic root of 1312240398 is about 1094.8075940580.

The spelling of 1312240398 in words is "one billion, three hundred twelve million, two hundred forty thousand, three hundred ninety-eight".