158191974 has 32 divisors (see below), whose sum is σ = 351959040. Its totient is φ = 52667496.

The previous prime is 158191973. The next prime is 158191993. The reversal of 158191974 is 479191851.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158191973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72747 + ... + 74889.

It is an arithmetic number, because the mean of its divisors is an integer number (10998720).

Almost surely, 2^158191974 is an apocalyptic number.

158191974 is an abundant number, since it is smaller than the sum of its proper divisors (193767066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

158191974 is a wasteful number, since it uses less digits than its factorization.

158191974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3521 (or 3515 counting only the distinct ones).

The product of its digits is 90720, while the sum is 45.

The square root of 158191974 is about 12577.4390875090. The cubic root of 158191974 is about 540.8308813865.

The spelling of 158191974 in words is "one hundred fifty-eight million, one hundred ninety-one thousand, nine hundred seventy-four".