158691387 has 16 divisors (see below), whose sum is σ = 219405312. Its totient is φ = 101916960.

The previous prime is 158691373. The next prime is 158691389. The reversal of 158691387 is 783196851.

It is not a de Polignac number, because 158691387 - 2⁸ = 158691131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158691389) 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, 17353 + ... + 24869.

It is an arithmetic number, because the mean of its divisors is an integer number (13712832).

Almost surely, 2^158691387 is an apocalyptic number.

158691387 is a deficient number, since it is larger than the sum of its proper divisors (60713925).

158691387 is a wasteful number, since it uses less digits than its factorization.

158691387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7778.

The product of its digits is 362880, while the sum is 48.

The square root of 158691387 is about 12597.2769676625. The cubic root of 158691387 is about 541.3994189466.

The spelling of 158691387 in words is "one hundred fifty-eight million, six hundred ninety-one thousand, three hundred eighty-seven".