137944393 has 4 divisors (see below), whose sum is σ = 139494420. Its totient is φ = 136394368.

The previous prime is 137944369. The next prime is 137944403. The reversal of 137944393 is 393449731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 94225849 + 43718544 = 9707^2 + 6612^2 .

It is a cyclic number.

It is not a de Polignac number, because 137944393 - 2²¹ = 135847241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137944193) 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, 774880 + ... + 775057.

It is an arithmetic number, because the mean of its divisors is an integer number (34873605).

Almost surely, 2^137944393 is an apocalyptic number.

It is an amenable number.

137944393 is a deficient number, since it is larger than the sum of its proper divisors (1550027).

137944393 is an equidigital number, since it uses as much as digits as its factorization.

137944393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550026.

The product of its digits is 244944, while the sum is 43.

The square root of 137944393 is about 11744.9730949032. The cubic root of 137944393 is about 516.6955058940.

The spelling of 137944393 in words is "one hundred thirty-seven million, nine hundred forty-four thousand, three hundred ninety-three".