137644405 has 4 divisors (see below), whose sum is σ = 165173292. Its totient is φ = 110115520.

The previous prime is 137644399. The next prime is 137644439. The reversal of 137644405 is 504446731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504446731 = 2647 ⋅190573.

It can be written as a sum of positive squares in 2 ways, for example, as 44116164 + 93528241 = 6642^2 + 9671^2 .

It is not a de Polignac number, because 137644405 - 2¹¹ = 137642357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13764436 + ... + 13764445.

It is an arithmetic number, because the mean of its divisors is an integer number (41293323).

Almost surely, 2^137644405 is an apocalyptic number.

It is an amenable number.

137644405 is a deficient number, since it is larger than the sum of its proper divisors (27528887).

137644405 is an equidigital number, since it uses as much as digits as its factorization.

137644405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27528886.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 137644405 is about 11732.1952336296. The cubic root of 137644405 is about 516.3206810693.

The spelling of 137644405 in words is "one hundred thirty-seven million, six hundred forty-four thousand, four hundred five".