157821452 has 6 divisors (see below), whose sum is σ = 276187548. Its totient is φ = 78910724.

The previous prime is 157821431. The next prime is 157821463. The reversal of 157821452 is 254128751.

It is a super-2 number, since 2×157821452² = 49815221422776608, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19727678 + ... + 19727685.

It is an arithmetic number, because the mean of its divisors is an integer number (46031258).

Almost surely, 2^157821452 is an apocalyptic number.

It is an amenable number.

157821452 is a deficient number, since it is larger than the sum of its proper divisors (118366096).

157821452 is a wasteful number, since it uses less digits than its factorization.

157821452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39455367 (or 39455365 counting only the distinct ones).

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

The square root of 157821452 is about 12562.7008242655. The cubic root of 157821452 is about 540.4083011682.

The spelling of 157821452 in words is "one hundred fifty-seven million, eight hundred twenty-one thousand, four hundred fifty-two".