121500390 has 64 divisors (see below), whose sum is σ = 319479552. Its totient is φ = 29328000.

The previous prime is 121500389. The next prime is 121500461. The reversal of 121500390 is 93005121.

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, 92740 + ... + 94040.

It is an arithmetic number, because the mean of its divisors is an integer number (4991868).

Almost surely, 2^121500390 is an apocalyptic number.

121500390 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 121500390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159739776).

121500390 is an abundant number, since it is smaller than the sum of its proper divisors (197979162).

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

121500390 is a wasteful number, since it uses less digits than its factorization.

121500390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 121500390 is about 11022.7215332694. The cubic root of 121500390 is about 495.2896172726.

The spelling of 121500390 in words is "one hundred twenty-one million, five hundred thousand, three hundred ninety".