121793840 has 40 divisors (see below), whose sum is σ = 323625120. Its totient is φ = 41757696.

The previous prime is 121793839. The next prime is 121793863. The reversal of 121793840 is 48397121.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 121793840.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108185 + ... + 109304.

It is an arithmetic number, because the mean of its divisors is an integer number (8090628).

Almost surely, 2^121793840 is an apocalyptic number.

121793840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121793840 is an abundant number, since it is smaller than the sum of its proper divisors (201831280).

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

121793840 is a wasteful number, since it uses less digits than its factorization.

121793840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217509 (or 217503 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 121793840 is about 11036.0246465836. The cubic root of 121793840 is about 495.6880409140.

The spelling of 121793840 in words is "one hundred twenty-one million, seven hundred ninety-three thousand, eight hundred forty".