158681394 has 24 divisors (see below), whose sum is σ = 344189820. Its totient is φ = 52835328.

The previous prime is 158681387. The next prime is 158681401. The reversal of 158681394 is 493186851.

158681394 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (158681387) and next prime (158681401).

It can be written as a sum of positive squares in 2 ways, for example, as 154629225 + 4052169 = 12435^2 + 2013^2 .

It is a Curzon number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 13794 + ... + 22530.

Almost surely, 2^158681394 is an apocalyptic number.

158681394 is an abundant number, since it is smaller than the sum of its proper divisors (185508426).

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

158681394 is a wasteful number, since it uses less digits than its factorization.

158681394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9754 (or 9751 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 158681394 is about 12596.8803280812. The cubic root of 158681394 is about 541.3880545030.

The spelling of 158681394 in words is "one hundred fifty-eight million, six hundred eighty-one thousand, three hundred ninety-four".