157189978 has 8 divisors (see below), whose sum is σ = 257220000. Its totient is φ = 71449980.

The previous prime is 157189969. The next prime is 157189979. The reversal of 157189978 is 879981751.

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

It is not an unprimeable number, because it can be changed into a prime (157189979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3572478 + ... + 3572521.

It is an arithmetic number, because the mean of its divisors is an integer number (32152500).

Almost surely, 2^157189978 is an apocalyptic number.

157189978 is a deficient number, since it is larger than the sum of its proper divisors (100030022).

157189978 is a wasteful number, since it uses less digits than its factorization.

157189978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7145012.

The product of its digits is 1270080, while the sum is 55.

The square root of 157189978 is about 12537.5427417018. The cubic root of 157189978 is about 539.6865785246.

The spelling of 157189978 in words is "one hundred fifty-seven million, one hundred eighty-nine thousand, nine hundred seventy-eight".