157443457 has 4 divisors (see below), whose sum is σ = 158004036. Its totient is φ = 156882880.

The previous prime is 157443449. The next prime is 157443479. The reversal of 157443457 is 754344751.

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 45104656 + 112338801 = 6716^2 + 10599^2 .

It is a cyclic number.

It is not a de Polignac number, because 157443457 - 2³ = 157443449 is a prime.

It is a super-2 number, since 2×157443457² = 49576884304221698, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157443437) 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 3 ways as a sum of consecutive naturals, for example, 279868 + ... + 280429.

It is an arithmetic number, because the mean of its divisors is an integer number (39501009).

Almost surely, 2^157443457 is an apocalyptic number.

It is an amenable number.

157443457 is a deficient number, since it is larger than the sum of its proper divisors (560579).

157443457 is an equidigital number, since it uses as much as digits as its factorization.

157443457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560578.

The product of its digits is 235200, while the sum is 40.

The square root of 157443457 is about 12547.6474687489. The cubic root of 157443457 is about 539.9765158969.

The spelling of 157443457 in words is "one hundred fifty-seven million, four hundred forty-three thousand, four hundred fifty-seven".