138737641 has 4 divisors (see below), whose sum is σ = 158557312. Its totient is φ = 118917972.

The previous prime is 138737569. The next prime is 138737647. The reversal of 138737641 is 146737831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 146737831 = 9091 ⋅16141.

It is a cyclic number.

It is not a de Polignac number, because 138737641 - 2⁷ = 138737513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138737594 and 138737603.

It is not an unprimeable number, because it can be changed into a prime (138737647) 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, 9909825 + ... + 9909838.

It is an arithmetic number, because the mean of its divisors is an integer number (39639328).

Almost surely, 2^138737641 is an apocalyptic number.

It is an amenable number.

138737641 is a deficient number, since it is larger than the sum of its proper divisors (19819671).

138737641 is an equidigital number, since it uses as much as digits as its factorization.

138737641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19819670.

The product of its digits is 84672, while the sum is 40.

The square root of 138737641 is about 11778.6943673737. The cubic root of 138737641 is about 517.6840311040.

The spelling of 138737641 in words is "one hundred thirty-eight million, seven hundred thirty-seven thousand, six hundred forty-one".