1318986957 has 16 divisors (see below), whose sum is σ = 1865202048. Its totient is φ = 827302080.

The previous prime is 1318986943. The next prime is 1318986979. The reversal of 1318986957 is 7596898131.

1318986957 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1318986957 - 2⁴ = 1318986941 is a prime.

It is a super-2 number, since 2×1318986957² = 3479453185472239698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1318986897 and 1318986906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318986937) 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, 152478 + ... + 160895.

It is an arithmetic number, because the mean of its divisors is an integer number (116575128).

Almost surely, 2^1318986957 is an apocalyptic number.

It is an amenable number.

1318986957 is a deficient number, since it is larger than the sum of its proper divisors (546215091).

1318986957 is a wasteful number, since it uses less digits than its factorization.

1318986957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313460.

The product of its digits is 3265920, while the sum is 57.

The square root of 1318986957 is about 36317.8600278155. The cubic root of 1318986957 is about 1096.6806151881.

The spelling of 1318986957 in words is "one billion, three hundred eighteen million, nine hundred eighty-six thousand, nine hundred fifty-seven".