157790042 has 8 divisors (see below), whose sum is σ = 240565332. Its totient is φ = 77601600.

The previous prime is 157790029. The next prime is 157790053. The reversal of 157790042 is 240097751.

It can be written as a sum of positive squares in 2 ways, for example, as 139736041 + 18054001 = 11821^2 + 4249^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 157789984 and 157790011.

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 in 3 ways as a sum of consecutive naturals, for example, 646559 + ... + 646802.

Almost surely, 2^157790042 is an apocalyptic number.

157790042 is a deficient number, since it is larger than the sum of its proper divisors (82775290).

157790042 is a wasteful number, since it uses less digits than its factorization.

157790042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1293424.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 157790042 is about 12561.4506327892. The cubic root of 157790042 is about 540.3724476753.

It can be divided in two parts, 1577 and 90042, that added together give a palindrome (91619).

The spelling of 157790042 in words is "one hundred fifty-seven million, seven hundred ninety thousand, forty-two".