157021742 has 4 divisors (see below), whose sum is σ = 235532616. Its totient is φ = 78510870.

The previous prime is 157021717. The next prime is 157021763. The reversal of 157021742 is 247120751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247120751 = 11353 ⋅21767.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39255434 + ... + 39255437.

It is an arithmetic number, because the mean of its divisors is an integer number (58883154).

Almost surely, 2^157021742 is an apocalyptic number.

157021742 is a deficient number, since it is larger than the sum of its proper divisors (78510874).

157021742 is an equidigital number, since it uses as much as digits as its factorization.

157021742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78510873.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 157021742 is about 12530.8316563586. The cubic root of 157021742 is about 539.4939726869.

Subtracting 157021742 from its reverse (247120751), we obtain a palindrome (90099009).

The spelling of 157021742 in words is "one hundred fifty-seven million, twenty-one thousand, seven hundred forty-two".