157217986 has 4 divisors (see below), whose sum is σ = 235826982. Its totient is φ = 78608992.

The previous prime is 157217941. The next prime is 157217987. The reversal of 157217986 is 689712751.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 142922025 + 14295961 = 11955^2 + 3781^2 .

It is a super-3 number, since 3×157217986³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (157217987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39304495 + ... + 39304498.

Almost surely, 2^157217986 is an apocalyptic number.

157217986 is a deficient number, since it is larger than the sum of its proper divisors (78608996).

157217986 is an equidigital number, since it uses as much as digits as its factorization.

157217986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78608995.

The product of its digits is 211680, while the sum is 46.

The square root of 157217986 is about 12538.6596572361. The cubic root of 157217986 is about 539.7186302796.

It can be divided in two parts, 157217 and 986, that added together give a triangular number (158203 = T₅₆₂).

The spelling of 157217986 in words is "one hundred fifty-seven million, two hundred seventeen thousand, nine hundred eighty-six".