1312782393 has 16 divisors (see below), whose sum is σ = 1885948736. Its totient is φ = 807468480.

The previous prime is 1312782377. The next prime is 1312782397. The reversal of 1312782393 is 3932872131.

It is not a de Polignac number, because 1312782393 - 2⁴ = 1312782377 is a prime.

It is a super-2 number, since 2×1312782393² = 3446795222741612898, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1312782397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85371 + ... + 99567.

It is an arithmetic number, because the mean of its divisors is an integer number (117871796).

Almost surely, 2^1312782393 is an apocalyptic number.

1312782393 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1312782393 is a deficient number, since it is larger than the sum of its proper divisors (573166343).

1312782393 is a wasteful number, since it uses less digits than its factorization.

1312782393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16584.

The product of its digits is 54432, while the sum is 39.

The square root of 1312782393 is about 36232.3390495287. The cubic root of 1312782393 is about 1094.9583028679.

The spelling of 1312782393 in words is "one billion, three hundred twelve million, seven hundred eighty-two thousand, three hundred ninety-three".