158640238 has 16 divisors (see below), whose sum is σ = 244978704. Its totient is φ = 76991040.

The previous prime is 158640227. The next prime is 158640259. The reversal of 158640238 is 832046851.

It is a happy number.

158640238 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×158640238² = 50333450225393288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a junction number, because it is equal to n+sod(n) for n = 158640197 and 158640206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31473 + ... + 36163.

It is an arithmetic number, because the mean of its divisors is an integer number (15311169).

Almost surely, 2^158640238 is an apocalyptic number.

158640238 is a deficient number, since it is larger than the sum of its proper divisors (86338466).

158640238 is a wasteful number, since it uses less digits than its factorization.

158640238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5187.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 158640238 is about 12595.2466430793. The cubic root of 158640238 is about 541.3412452063.

The spelling of 158640238 in words is "one hundred fifty-eight million, six hundred forty thousand, two hundred thirty-eight".