137823991 has 8 divisors (see below), whose sum is σ = 139403264. Its totient is φ = 136249560.

The previous prime is 137823971. The next prime is 137823997. The reversal of 137823991 is 199328731.

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

It is a cyclic number.

It is not a de Polignac number, because 137823991 - 2²¹ = 135726839 is a prime.

It is a super-5 number, since 5×137823991⁵ (a number of 42 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137823997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111346 + ... + 112576.

It is an arithmetic number, because the mean of its divisors is an integer number (17425408).

Almost surely, 2^137823991 is an apocalyptic number.

137823991 is a deficient number, since it is larger than the sum of its proper divisors (1579273).

137823991 is a wasteful number, since it uses less digits than its factorization.

137823991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2421.

The product of its digits is 81648, while the sum is 43.

The square root of 137823991 is about 11739.8462937127. The cubic root of 137823991 is about 516.5451330284.

The spelling of 137823991 in words is "one hundred thirty-seven million, eight hundred twenty-three thousand, nine hundred ninety-one".