157872421 has 8 divisors (see below), whose sum is σ = 191039040. Its totient is φ = 127359168.

The previous prime is 157872419. The next prime is 157872431. The reversal of 157872421 is 124278751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 157872421 - 2¹ = 157872419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157872431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 663211 + ... + 663448.

It is an arithmetic number, because the mean of its divisors is an integer number (23879880).

Almost surely, 2^157872421 is an apocalyptic number.

It is an amenable number.

157872421 is a deficient number, since it is larger than the sum of its proper divisors (33166619).

157872421 is a wasteful number, since it uses less digits than its factorization.

157872421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326683.

The product of its digits is 31360, while the sum is 37.

The square root of 157872421 is about 12564.7292449937. The cubic root of 157872421 is about 540.4664705019.

The spelling of 157872421 in words is "one hundred fifty-seven million, eight hundred seventy-two thousand, four hundred twenty-one".