121290540 has 96 divisors (see below), whose sum is σ = 389781504. Its totient is φ = 27605760.

The previous prime is 121290527. The next prime is 121290581. The reversal of 121290540 is 45092121.

It is a super-2 number, since 2×121290540² = 29422790186983200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121290540.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132685 + ... + 133595.

It is an arithmetic number, because the mean of its divisors is an integer number (4060224).

Almost surely, 2^121290540 is an apocalyptic number.

121290540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121290540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194890752).

121290540 is an abundant number, since it is smaller than the sum of its proper divisors (268490964).

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

121290540 is a wasteful number, since it uses less digits than its factorization.

121290540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247 (or 1245 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 121290540 is about 11013.1984455017. The cubic root of 121290540 is about 495.0043056456.

The spelling of 121290540 in words is "one hundred twenty-one million, two hundred ninety thousand, five hundred forty".