137720377 has 2 divisors, whose sum is σ = 137720378. Its totient is φ = 137720376.

The previous prime is 137720347. The next prime is 137720419. The reversal of 137720377 is 773027731.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136866601 + 853776 = 11699^2 + 924^2 .

It is a cyclic number.

It is not a de Polignac number, because 137720377 - 2¹⁵ = 137687609 is a prime.

It is not a weakly prime, because it can be changed into another prime (137720347) 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, 68860188 + 68860189.

It is an arithmetic number, because the mean of its divisors is an integer number (68860189).

Almost surely, 2^137720377 is an apocalyptic number.

It is an amenable number.

137720377 is a deficient number, since it is larger than the sum of its proper divisors (1).

137720377 is an equidigital number, since it uses as much as digits as its factorization.

137720377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43218, while the sum is 37.

The square root of 137720377 is about 11735.4325442226. The cubic root of 137720377 is about 516.4156569606.

The spelling of 137720377 in words is "one hundred thirty-seven million, seven hundred twenty thousand, three hundred seventy-seven".