157973621 has 8 divisors (see below), whose sum is σ = 173009760. Its totient is φ = 143349552.

The previous prime is 157973611. The next prime is 157973659. The reversal of 157973621 is 126379751.

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 157973621 - 2²² = 153779317 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 (157973611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102215 + ... + 103748.

It is an arithmetic number, because the mean of its divisors is an integer number (21626220).

Almost surely, 2^157973621 is an apocalyptic number.

It is an amenable number.

157973621 is a deficient number, since it is larger than the sum of its proper divisors (15036139).

157973621 is a wasteful number, since it uses less digits than its factorization.

157973621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206035.

The product of its digits is 79380, while the sum is 41.

The square root of 157973621 is about 12568.7557458963. The cubic root of 157973621 is about 540.5819298153.

The spelling of 157973621 in words is "one hundred fifty-seven million, nine hundred seventy-three thousand, six hundred twenty-one".