157699947 has 8 divisors (see below), whose sum is σ = 210327040. Its totient is φ = 105103080.

The previous prime is 157699933. The next prime is 157699951. The reversal of 157699947 is 749996751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 157699947 - 2⁴ = 157699931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157692947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11454 + ... + 21132.

It is an arithmetic number, because the mean of its divisors is an integer number (26290880).

Almost surely, 2^157699947 is an apocalyptic number.

157699947 is a deficient number, since it is larger than the sum of its proper divisors (52627093).

157699947 is an equidigital number, since it uses as much as digits as its factorization.

157699947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15113.

The product of its digits is 4286520, while the sum is 57.

The square root of 157699947 is about 12557.8639505292. The cubic root of 157699947 is about 540.2695807600.

The spelling of 157699947 in words is "one hundred fifty-seven million, six hundred ninety-nine thousand, nine hundred forty-seven".