1396978159 has 2 divisors, whose sum is σ = 1396978160. Its totient is φ = 1396978158.

The previous prime is 1396978147. The next prime is 1396978201. The reversal of 1396978159 is 9518796931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1396978159 - 2⁵ = 1396978127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1396978139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698489079 + 698489080.

It is an arithmetic number, because the mean of its divisors is an integer number (698489080).

Almost surely, 2^1396978159 is an apocalyptic number.

1396978159 is a deficient number, since it is larger than the sum of its proper divisors (1).

1396978159 is an equidigital number, since it uses as much as digits as its factorization.

1396978159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 58.

The square root of 1396978159 is about 37376.1710050669. The cubic root of 1396978159 is about 1117.8834813065.

The spelling of 1396978159 in words is "one billion, three hundred ninety-six million, nine hundred seventy-eight thousand, one hundred fifty-nine".