138555737 has 4 divisors (see below), whose sum is σ = 138608820. Its totient is φ = 138502656.

The previous prime is 138555721. The next prime is 138555743. The reversal of 138555737 is 737555831.

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 56490256 + 82065481 = 7516^2 + 9059^2 .

It is a cyclic number.

It is not a de Polignac number, because 138555737 - 2⁴ = 138555721 is a prime.

It is a super-2 number, since 2×138555737² = 38395384511226338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138555757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22412 + ... + 27917.

It is an arithmetic number, because the mean of its divisors is an integer number (34652205).

Almost surely, 2^138555737 is an apocalyptic number.

It is an amenable number.

138555737 is a deficient number, since it is larger than the sum of its proper divisors (53083).

138555737 is an equidigital number, since it uses as much as digits as its factorization.

138555737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53082.

The product of its digits is 441000, while the sum is 44.

The square root of 138555737 is about 11770.9700959607. The cubic root of 138555737 is about 517.4576806549.

The spelling of 138555737 in words is "one hundred thirty-eight million, five hundred fifty-five thousand, seven hundred thirty-seven".