157972226 has 4 divisors (see below), whose sum is σ = 236958342. Its totient is φ = 78986112.

The previous prime is 157972223. The next prime is 157972259. The reversal of 157972226 is 622279751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 622279751 = 7127 ⋅87313.

It can be written as a sum of positive squares in only one way, i.e., 101707225 + 56265001 = 10085^2 + 7501^2 .

It is not an unprimeable number, because it can be changed into a prime (157972223) 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 as a sum of consecutive naturals, namely, 39493055 + ... + 39493058.

Almost surely, 2^157972226 is an apocalyptic number.

157972226 is a deficient number, since it is larger than the sum of its proper divisors (78986116).

157972226 is an equidigital number, since it uses as much as digits as its factorization.

157972226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78986115.

The product of its digits is 105840, while the sum is 41.

The square root of 157972226 is about 12568.7002510204. The cubic root of 157972226 is about 540.5803385918.

The spelling of 157972226 in words is "one hundred fifty-seven million, nine hundred seventy-two thousand, two hundred twenty-six".