137721443 has 4 divisors (see below), whose sum is σ = 144969960. Its totient is φ = 130472928.

The previous prime is 137721439. The next prime is 137721457. The reversal of 137721443 is 344127731.

137721443 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.

It is a cyclic number.

It is not a de Polignac number, because 137721443 - 2² = 137721439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137721413) 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, 3624230 + ... + 3624267.

It is an arithmetic number, because the mean of its divisors is an integer number (36242490).

Almost surely, 2^137721443 is an apocalyptic number.

137721443 is a deficient number, since it is larger than the sum of its proper divisors (7248517).

137721443 is an equidigital number, since it uses as much as digits as its factorization.

137721443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7248516.

The product of its digits is 14112, while the sum is 32.

The square root of 137721443 is about 11735.4779621454. The cubic root of 137721443 is about 516.4169893649.

The spelling of 137721443 in words is "one hundred thirty-seven million, seven hundred twenty-one thousand, four hundred forty-three".