137778949 has 24 divisors (see below), whose sum is σ = 176811264. Its totient is φ = 105045600.

The previous prime is 137778941. The next prime is 137779079. The reversal of 137778949 is 949877731.

It is not a de Polignac number, because 137778949 - 2³ = 137778941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 137778949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137778941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38079 + ... + 41539.

It is an arithmetic number, because the mean of its divisors is an integer number (7367136).

Almost surely, 2^137778949 is an apocalyptic number.

It is an amenable number.

137778949 is a deficient number, since it is larger than the sum of its proper divisors (39032315).

137778949 is a wasteful number, since it uses less digits than its factorization.

137778949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3537 (or 3526 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 55.

The square root of 137778949 is about 11737.9277983808. The cubic root of 137778949 is about 516.4888565154.

The spelling of 137778949 in words is "one hundred thirty-seven million, seven hundred seventy-eight thousand, nine hundred forty-nine".