157756493 has 4 divisors (see below), whose sum is σ = 162020220. Its totient is φ = 153492768.

The previous prime is 157756439. The next prime is 157756513. The reversal of 157756493 is 394657751.

It is a happy number.

157756493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67848169 + 89908324 = 8237^2 + 9482^2 .

It is a cyclic number.

It is not a de Polignac number, because 157756493 - 2⁶ = 157756429 is a prime.

It is a super-2 number, since 2×157756493² = 49774222167318098, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157786493) 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, 2131808 + ... + 2131881.

It is an arithmetic number, because the mean of its divisors is an integer number (40505055).

Almost surely, 2^157756493 is an apocalyptic number.

It is an amenable number.

157756493 is a deficient number, since it is larger than the sum of its proper divisors (4263727).

157756493 is an equidigital number, since it uses as much as digits as its factorization.

157756493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4263726.

The product of its digits is 793800, while the sum is 47.

The square root of 157756493 is about 12560.1151666695. The cubic root of 157756493 is about 540.3341473280.

The spelling of 157756493 in words is "one hundred fifty-seven million, seven hundred fifty-six thousand, four hundred ninety-three".