137940749 has 2 divisors, whose sum is σ = 137940750. Its totient is φ = 137940748.

The previous prime is 137940743. The next prime is 137940763. The reversal of 137940749 is 947049731.

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., 137475625 + 465124 = 11725^2 + 682^2 .

It is an emirp because it is prime and its reverse (947049731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 137940749 - 2¹² = 137936653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137940743) 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, 68970374 + 68970375.

It is an arithmetic number, because the mean of its divisors is an integer number (68970375).

Almost surely, 2^137940749 is an apocalyptic number.

It is an amenable number.

137940749 is a deficient number, since it is larger than the sum of its proper divisors (1).

137940749 is an equidigital number, since it uses as much as digits as its factorization.

137940749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 137940749 is about 11744.8179636808. The cubic root of 137940749 is about 516.6909561017.

The spelling of 137940749 in words is "one hundred thirty-seven million, nine hundred forty thousand, seven hundred forty-nine".