137878849 has 4 divisors (see below), whose sum is σ = 140139220. Its totient is φ = 135618480.

The previous prime is 137878843. The next prime is 137878879. The reversal of 137878849 is 948878731.

It is a happy number.

137878849 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: 948878731 = 23 ⋅41255597.

It can be written as a sum of positive squares in 2 ways, for example, as 16548624 + 121330225 = 4068^2 + 11015^2 .

It is a cyclic number.

It is not a de Polignac number, because 137878849 - 2⁵ = 137878817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137878849.

It is not an unprimeable number, because it can be changed into a prime (137878843) 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, 1130094 + ... + 1130215.

It is an arithmetic number, because the mean of its divisors is an integer number (35034805).

Almost surely, 2^137878849 is an apocalyptic number.

It is an amenable number.

137878849 is a deficient number, since it is larger than the sum of its proper divisors (2260371).

137878849 is an equidigital number, since it uses as much as digits as its factorization.

137878849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260370.

The product of its digits is 2709504, while the sum is 55.

The square root of 137878849 is about 11742.1824632391. The cubic root of 137878849 is about 516.6136573202.

The spelling of 137878849 in words is "one hundred thirty-seven million, eight hundred seventy-eight thousand, eight hundred forty-nine".