121997400 has 192 divisors, whose sum is σ = 446638080. Its totient is φ = 26956800.

The previous prime is 121997387. The next prime is 121997417. The reversal of 121997400 is 4799121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 129732 + ... + 130668.

It is an arithmetic number, because the mean of its divisors is an integer number (2326240).

Almost surely, 2^121997400 is an apocalyptic number.

121997400 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 121997400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223319040).

121997400 is an abundant number, since it is smaller than the sum of its proper divisors (324640680).

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

121997400 is a wasteful number, since it uses less digits than its factorization.

121997400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994 (or 985 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 121997400 is about 11045.2433200903. The cubic root of 121997400 is about 495.9640430923.

The spelling of 121997400 in words is "one hundred twenty-one million, nine hundred ninety-seven thousand, four hundred".