121292840 has 16 divisors (see below), whose sum is σ = 272908980. Its totient is φ = 48517120.

The previous prime is 121292837. The next prime is 121292861. The reversal of 121292840 is 48292121.

It can be written as a sum of positive squares in 2 ways, for example, as 112063396 + 9229444 = 10586^2 + 3038^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516121 + ... + 1516200.

Almost surely, 2^121292840 is an apocalyptic number.

121292840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121292840 is an abundant number, since it is smaller than the sum of its proper divisors (151616140).

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

121292840 is a wasteful number, since it uses less digits than its factorization.

121292840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3032332 (or 3032328 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 121292840 is about 11013.3028651717. The cubic root of 121292840 is about 495.0074345039.

The spelling of 121292840 in words is "one hundred twenty-one million, two hundred ninety-two thousand, eight hundred forty".