121428792 has 24 divisors (see below), whose sum is σ = 328869840. Its totient is φ = 40476240.

The previous prime is 121428781. The next prime is 121428793. The reversal of 121428792 is 297824121.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121428793) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 843184 + ... + 843327.

It is an arithmetic number, because the mean of its divisors is an integer number (13702910).

Almost surely, 2^121428792 is an apocalyptic number.

121428792 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121428792 is an abundant number, since it is smaller than the sum of its proper divisors (207441048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121428792 is a wasteful number, since it uses less digits than its factorization.

121428792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686523 (or 1686516 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 121428792 is about 11019.4733086477. The cubic root of 121428792 is about 495.1923097277.

The spelling of 121428792 in words is "one hundred twenty-one million, four hundred twenty-eight thousand, seven hundred ninety-two".