157720469 has 4 divisors (see below), whose sum is σ = 157938144. Its totient is φ = 157502796.

The previous prime is 157720457. The next prime is 157720477. The reversal of 157720469 is 964027751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 157720469 - 2¹² = 157716373 is a prime.

It is a super-2 number, since 2×157720469² = 49751492683159922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157720669) 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, 107747 + ... + 109200.

It is an arithmetic number, because the mean of its divisors is an integer number (39484536).

Almost surely, 2^157720469 is an apocalyptic number.

It is an amenable number.

157720469 is a deficient number, since it is larger than the sum of its proper divisors (217675).

157720469 is an equidigital number, since it uses as much as digits as its factorization.

157720469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217674.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 157720469 is about 12558.6810215086. The cubic root of 157720469 is about 540.2930154148.

The spelling of 157720469 in words is "one hundred fifty-seven million, seven hundred twenty thousand, four hundred sixty-nine".