138842237 has 8 divisors (see below), whose sum is σ = 146235456. Its totient is φ = 131562112.

The previous prime is 138842153. The next prime is 138842261. The reversal of 138842237 is 732248831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138842237 - 2⁸ = 138841981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138842237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138842267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25748 + ... + 30669.

It is an arithmetic number, because the mean of its divisors is an integer number (18279432).

Almost surely, 2^138842237 is an apocalyptic number.

It is an amenable number.

138842237 is a deficient number, since it is larger than the sum of its proper divisors (7393219).

138842237 is a wasteful number, since it uses less digits than its factorization.

138842237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56547.

The product of its digits is 64512, while the sum is 38.

The square root of 138842237 is about 11783.1335815224. The cubic root of 138842237 is about 517.8140945261.

The spelling of 138842237 in words is "one hundred thirty-eight million, eight hundred forty-two thousand, two hundred thirty-seven".