137847621 has 4 divisors (see below), whose sum is σ = 183796832. Its totient is φ = 91898412.

The previous prime is 137847587. The next prime is 137847623. The reversal of 137847621 is 126748731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 126748731 = 3 ⋅42249577.

It is not a de Polignac number, because 137847621 - 2⁶ = 137847557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137847621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137847623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22974601 + ... + 22974606.

It is an arithmetic number, because the mean of its divisors is an integer number (45949208).

Almost surely, 2^137847621 is an apocalyptic number.

It is an amenable number.

137847621 is a deficient number, since it is larger than the sum of its proper divisors (45949211).

137847621 is an equidigital number, since it uses as much as digits as its factorization.

137847621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45949210.

The product of its digits is 56448, while the sum is 39.

The square root of 137847621 is about 11740.8526521714. The cubic root of 137847621 is about 516.5746519917.

The spelling of 137847621 in words is "one hundred thirty-seven million, eight hundred forty-seven thousand, six hundred twenty-one".