157852421 has 4 divisors (see below), whose sum is σ = 157886892. Its totient is φ = 157817952.

The previous prime is 157852411. The next prime is 157852433. The reversal of 157852421 is 124258751.

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 72012196 + 85840225 = 8486^2 + 9265^2 .

It is a cyclic number.

It is not a de Polignac number, because 157852421 - 2²² = 153658117 is a prime.

It is a super-2 number, since 2×157852421² = 49834773631122482, 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 (157852411) 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, 9080 + ... + 19953.

It is an arithmetic number, because the mean of its divisors is an integer number (39471723).

Almost surely, 2^157852421 is an apocalyptic number.

It is an amenable number.

157852421 is a deficient number, since it is larger than the sum of its proper divisors (34471).

157852421 is an equidigital number, since it uses as much as digits as its factorization.

157852421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34470.

The product of its digits is 22400, while the sum is 35.

The square root of 157852421 is about 12563.9333411158. The cubic root of 157852421 is about 540.4436466170.

The spelling of 157852421 in words is "one hundred fifty-seven million, eight hundred fifty-two thousand, four hundred twenty-one".