121326390 has 64 divisors (see below), whose sum is σ = 325321920. Its totient is φ = 32175360.

The previous prime is 121326341. The next prime is 121326391. The reversal of 121326390 is 93623121.

121326390 is a `hidden beast` number, since 1 + 21 + 3 + 2 + 639 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121326391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52050 + ... + 54330.

It is an arithmetic number, because the mean of its divisors is an integer number (5083155).

Almost surely, 2^121326390 is an apocalyptic number.

121326390 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 121326390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162660960).

121326390 is an abundant number, since it is smaller than the sum of its proper divisors (203995530).

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

121326390 is a wasteful number, since it uses less digits than its factorization.

121326390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494 (or 2488 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 121326390 is about 11014.8259178255. The cubic root of 121326390 is about 495.0530705266.

The spelling of 121326390 in words is "one hundred twenty-one million, three hundred twenty-six thousand, three hundred ninety".