121838872 has 8 divisors (see below), whose sum is σ = 228447900. Its totient is φ = 60919432.

The previous prime is 121838869. The next prime is 121838879. The reversal of 121838872 is 278838121.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121838879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7614922 + ... + 7614937.

Almost surely, 2^121838872 is an apocalyptic number.

It is an amenable number.

121838872 is a deficient number, since it is larger than the sum of its proper divisors (106609028).

121838872 is a wasteful number, since it uses less digits than its factorization.

121838872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15229865 (or 15229861 counting only the distinct ones).

The product of its digits is 43008, while the sum is 40.

The square root of 121838872 is about 11038.0646854419. The cubic root of 121838872 is about 495.7491252111.

The spelling of 121838872 in words is "one hundred twenty-one million, eight hundred thirty-eight thousand, eight hundred seventy-two".