137988397 has 2 divisors, whose sum is σ = 137988398. Its totient is φ = 137988396.

The previous prime is 137988349. The next prime is 137988401. The reversal of 137988397 is 793889731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137968516 + 19881 = 11746^2 + 141^2 .

It is a cyclic number.

It is not a de Polignac number, because 137988397 - 2¹¹ = 137986349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137988307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68994198 + 68994199.

It is an arithmetic number, because the mean of its divisors is an integer number (68994199).

Almost surely, 2^137988397 is an apocalyptic number.

It is an amenable number.

137988397 is a deficient number, since it is larger than the sum of its proper divisors (1).

137988397 is an equidigital number, since it uses as much as digits as its factorization.

137988397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 55.

The square root of 137988397 is about 11746.8462576131. The cubic root of 137988397 is about 516.7504416821.

The spelling of 137988397 in words is "one hundred thirty-seven million, nine hundred eighty-eight thousand, three hundred ninety-seven".