137720844 has 24 divisors (see below), whose sum is σ = 357054320. Its totient is φ = 45906912.

The previous prime is 137720839. The next prime is 137720861. The reversal of 137720844 is 448027731.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 137720799 and 137720808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 637489 + ... + 637704.

Almost surely, 2^137720844 is an apocalyptic number.

It is an amenable number.

137720844 is an abundant number, since it is smaller than the sum of its proper divisors (219333476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

137720844 is a wasteful number, since it uses less digits than its factorization.

137720844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275206 (or 1275198 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 137720844 is about 11735.4524412142. The cubic root of 137720844 is about 516.4162406696.

The spelling of 137720844 in words is "one hundred thirty-seven million, seven hundred twenty thousand, eight hundred forty-four".