137698909 has 8 divisors (see below), whose sum is σ = 146694240. Its totient is φ = 128878416.

The previous prime is 137698877. The next prime is 137698919. The reversal of 137698909 is 909896731.

137698909 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 not a de Polignac number, because 137698909 - 2⁵ = 137698877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137698919) 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, 42082 + ... + 45235.

It is an arithmetic number, because the mean of its divisors is an integer number (18336780).

Almost surely, 2^137698909 is an apocalyptic number.

137698909 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

137698909 is a deficient number, since it is larger than the sum of its proper divisors (8995331).

137698909 is an equidigital number, since it uses as much as digits as its factorization.

137698909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87419.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 137698909 is about 11734.5178426725. The cubic root of 137698909 is about 516.3888224242.

The spelling of 137698909 in words is "one hundred thirty-seven million, six hundred ninety-eight thousand, nine hundred nine".