138421607 has 4 divisors (see below), whose sum is σ = 139691640. Its totient is φ = 137151576.

The previous prime is 138421589. The next prime is 138421639. The reversal of 138421607 is 706124831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138421607 - 2²⁶ = 71312743 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 (138421307) 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, 634853 + ... + 635070.

It is an arithmetic number, because the mean of its divisors is an integer number (34922910).

Almost surely, 2^138421607 is an apocalyptic number.

138421607 is a deficient number, since it is larger than the sum of its proper divisors (1270033).

138421607 is a wasteful number, since it uses less digits than its factorization.

138421607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270032.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 138421607 is about 11765.2712250929. The cubic root of 138421607 is about 517.2906503829.

The spelling of 138421607 in words is "one hundred thirty-eight million, four hundred twenty-one thousand, six hundred seven".