121392728 has 32 divisors (see below), whose sum is σ = 233280000. Its totient is φ = 59194272.

The previous prime is 121392727. The next prime is 121392749. The reversal of 121392728 is 827293121.

It is a super-2 number, since 2×121392728² = 29472388822563968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121392721) 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, 187301 + ... + 187947.

It is an arithmetic number, because the mean of its divisors is an integer number (7290000).

Almost surely, 2^121392728 is an apocalyptic number.

It is an amenable number.

121392728 is a deficient number, since it is larger than the sum of its proper divisors (111887272).

121392728 is a wasteful number, since it uses less digits than its factorization.

121392728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199 (or 1195 counting only the distinct ones).

The product of its digits is 12096, while the sum is 35.

The square root of 121392728 is about 11017.8368112802. The cubic root of 121392728 is about 495.1432813124.

The spelling of 121392728 in words is "one hundred twenty-one million, three hundred ninety-two thousand, seven hundred twenty-eight".