157427209 has 3 divisors (see below), whose sum is σ = 157439757. Its totient is φ = 157414662.

The previous prime is 157427189. The next prime is 157427227. The reversal of 157427209 is 902724751.

The square root of 157427209 is 12547.

It is a perfect power (a square), and thus also a powerful number.

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.

It is not a de Polignac number, because 157427209 - 2¹⁵ = 157394441 is a prime.

It is a super-2 number, since 2×157427209² = 49566652267059362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157427239) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 6274 + ... + 18820.

It is an arithmetic number, because the mean of its divisors is an integer number (52479919).

Almost surely, 2^157427209 is an apocalyptic number.

157427209 is the 12547-th square number.

157427209 is the 6274-th centered octagonal number.

It is an amenable number.

157427209 is a deficient number, since it is larger than the sum of its proper divisors (12548).

157427209 is an frugal number, since it uses more digits than its factorization.

157427209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25094 (or 12547 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The cubic root of 157427209 is about 539.9579402541.

The spelling of 157427209 in words is "one hundred fifty-seven million, four hundred twenty-seven thousand, two hundred nine".