137899 has 4 divisors (see below), whose sum is σ = 141664. Its totient is φ = 134136.

The previous prime is 137873. The next prime is 137909. The reversal of 137899 is 998731.

137899 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, and also an emirpimes, since its reverse is a distinct semiprime: 998731 = 29 ⋅34439.

It is a cyclic number.

It is not a de Polignac number, because 137899 - 2⁵ = 137867 is a prime.

It is a super-2 number, since 2×137899² = 38032268402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 3727 = 137899 / (1 + 3 + 7 + 8 + 9 + 9).

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137849) 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, 1827 + ... + 1900.

It is an arithmetic number, because the mean of its divisors is an integer number (35416).

137899 is a Friedman number, since it can be written as 7*(9+8+3^9)-1, using all its digits and the basic arithmetic operations.

2¹³⁷⁸⁹⁹ is an apocalyptic number.

137899 is a deficient number, since it is larger than the sum of its proper divisors (3765).

137899 is an equidigital number, since it uses as much as digits as its factorization.

137899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3764.

The product of its digits is 13608, while the sum is 37.

The square root of 137899 is about 371.3475461074. The cubic root of 137899 is about 51.6638823797.

The spelling of 137899 in words is "one hundred thirty-seven thousand, eight hundred ninety-nine".