121406280 has 32 divisors (see below), whose sum is σ = 364219200. Its totient is φ = 32374976.

The previous prime is 121406273. The next prime is 121406291. The reversal of 121406280 is 82604121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 121406280.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505740 + ... + 505979.

It is an arithmetic number, because the mean of its divisors is an integer number (11381850).

Almost surely, 2^121406280 is an apocalyptic number.

121406280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121406280 is an abundant number, since it is smaller than the sum of its proper divisors (242812920).

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

121406280 is a wasteful number, since it uses less digits than its factorization.

121406280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011733 (or 1011729 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 121406280 is about 11018.4517968724. The cubic root of 121406280 is about 495.1617061724.

The spelling of 121406280 in words is "one hundred twenty-one million, four hundred six thousand, two hundred eighty".