1396981507 has 4 divisors (see below), whose sum is σ = 1397068120. Its totient is φ = 1396894896.

The previous prime is 1396981501. The next prime is 1396981577. The reversal of 1396981507 is 7051896931.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7051896931 = 67 ⋅105252193.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1396981507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1396981501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11157 + ... + 54022.

It is an arithmetic number, because the mean of its divisors is an integer number (349267030).

Almost surely, 2^1396981507 is an apocalyptic number.

1396981507 is a deficient number, since it is larger than the sum of its proper divisors (86613).

1396981507 is an equidigital number, since it uses as much as digits as its factorization.

1396981507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86612.

The product of its (nonzero) digits is 408240, while the sum is 49.

The square root of 1396981507 is about 37376.2157929344. The cubic root of 1396981507 is about 1117.8843743462.

The spelling of 1396981507 in words is "one billion, three hundred ninety-six million, nine hundred eighty-one thousand, five hundred seven".