138262621 has 4 divisors (see below), whose sum is σ = 158014432. Its totient is φ = 118510812.

The previous prime is 138262609. The next prime is 138262651. The reversal of 138262621 is 126262831.

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.

It is not a de Polignac number, because 138262621 - 2⁷ = 138262493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138262651) 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, 9875895 + ... + 9875908.

It is an arithmetic number, because the mean of its divisors is an integer number (39503608).

Almost surely, 2^138262621 is an apocalyptic number.

It is an amenable number.

138262621 is a deficient number, since it is larger than the sum of its proper divisors (19751811).

138262621 is an equidigital number, since it uses as much as digits as its factorization.

138262621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19751810.

The product of its digits is 6912, while the sum is 31.

The square root of 138262621 is about 11758.5127035693. The cubic root of 138262621 is about 517.0925274648.

The spelling of 138262621 in words is "one hundred thirty-eight million, two hundred sixty-two thousand, six hundred twenty-one".