137644399 has 2 divisors, whose sum is σ = 137644400. Its totient is φ = 137644398.

The previous prime is 137644387. The next prime is 137644439. The reversal of 137644399 is 993446731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 137644399 - 2¹³ = 137636207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137644349) 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 as a sum of consecutive naturals, namely, 68822199 + 68822200.

It is an arithmetic number, because the mean of its divisors is an integer number (68822200).

Almost surely, 2^137644399 is an apocalyptic number.

137644399 is a deficient number, since it is larger than the sum of its proper divisors (1).

137644399 is an equidigital number, since it uses as much as digits as its factorization.

137644399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 46.

The square root of 137644399 is about 11732.1949779229. The cubic root of 137644399 is about 516.3206735671.

The spelling of 137644399 in words is "one hundred thirty-seven million, six hundred forty-four thousand, three hundred ninety-nine".