137944621 has 8 divisors (see below), whose sum is σ = 142289784. Its totient is φ = 133632000.

The previous prime is 137944553. The next prime is 137944633. The reversal of 137944621 is 126449731.

137944621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 51194025 + 86750596 = 7155^2 + 9314^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 137944621 - 2⁹ = 137944109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137944021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621 + ... + 16621.

It is an arithmetic number, because the mean of its divisors is an integer number (17786223).

Almost surely, 2^137944621 is an apocalyptic number.

It is an amenable number.

137944621 is a deficient number, since it is larger than the sum of its proper divisors (4345163).

137944621 is a wasteful number, since it uses less digits than its factorization.

137944621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16271.

The product of its digits is 36288, while the sum is 37.

The square root of 137944621 is about 11744.9828011794. The cubic root of 137944621 is about 516.6957905655.

The spelling of 137944621 in words is "one hundred thirty-seven million, nine hundred forty-four thousand, six hundred twenty-one".