121893390 has 64 divisors (see below), whose sum is σ = 332640000. Its totient is φ = 31745952.

The previous prime is 121893389. The next prime is 121893413. The reversal of 121893390 is 93398121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6361 + ... + 16859.

It is an arithmetic number, because the mean of its divisors is an integer number (5197500).

Almost surely, 2^121893390 is an apocalyptic number.

121893390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121893390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166320000).

121893390 is an abundant number, since it is smaller than the sum of its proper divisors (210746610).

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

121893390 is a wasteful number, since it uses less digits than its factorization.

121893390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10558 (or 10552 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 121893390 is about 11040.5339544788. The cubic root of 121893390 is about 495.8230567902.

The spelling of 121893390 in words is "one hundred twenty-one million, eight hundred ninety-three thousand, three hundred ninety".