1396720157 has 12 divisors (see below), whose sum is σ = 1652297760. Its totient is φ = 1176894936.

The previous prime is 1396720151. The next prime is 1396720163. The reversal of 1396720157 is 7510276931.

It is an interprime number because it is at equal distance from previous prime (1396720151) and next prime (1396720163).

It is not a de Polignac number, because 1396720157 - 2⁶ = 1396720093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1396720151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238673 + ... + 244454.

It is an arithmetic number, because the mean of its divisors is an integer number (137691480).

Almost surely, 2^1396720157 is an apocalyptic number.

It is an amenable number.

1396720157 is a deficient number, since it is larger than the sum of its proper divisors (255577603).

1396720157 is an equidigital number, since it uses as much as digits as its factorization.

1396720157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483200 (or 483193 counting only the distinct ones).

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 1396720157 is about 37372.7194220597. The cubic root of 1396720157 is about 1117.8146580088.

The spelling of 1396720157 in words is "one billion, three hundred ninety-six million, seven hundred twenty thousand, one hundred fifty-seven".