137899807 has 4 divisors (see below), whose sum is σ = 138171240. Its totient is φ = 137628376.

The previous prime is 137899763. The next prime is 137899819. The reversal of 137899807 is 708998731.

137899807 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 137899807 - 2²⁷ = 3682079 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 (137899877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134953 + ... + 135970.

It is an arithmetic number, because the mean of its divisors is an integer number (34542810).

Almost surely, 2^137899807 is an apocalyptic number.

137899807 is a deficient number, since it is larger than the sum of its proper divisors (271433).

137899807 is an equidigital number, since it uses as much as digits as its factorization.

137899807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271432.

The product of its (nonzero) digits is 762048, while the sum is 52.

The square root of 137899807 is about 11743.0748528654. The cubic root of 137899807 is about 516.6398316043.

The spelling of 137899807 in words is "one hundred thirty-seven million, eight hundred ninety-nine thousand, eight hundred seven".