137663993 has 8 divisors (see below), whose sum is σ = 143864448. Its totient is φ = 131481504.

The previous prime is 137663989. The next prime is 137664001. The reversal of 137663993 is 399366731.

137663993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 137663993 - 2² = 137663989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (137663983) 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, 12605 + ... + 20837.

It is an arithmetic number, because the mean of its divisors is an integer number (17983056).

Almost surely, 2^137663993 is an apocalyptic number.

It is an amenable number.

137663993 is a deficient number, since it is larger than the sum of its proper divisors (6200455).

137663993 is an equidigital number, since it uses as much as digits as its factorization.

137663993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8983.

The product of its digits is 551124, while the sum is 47.

The square root of 137663993 is about 11733.0300008139. The cubic root of 137663993 is about 516.3451722204.

The spelling of 137663993 in words is "one hundred thirty-seven million, six hundred sixty-three thousand, nine hundred ninety-three".