121640394 has 48 divisors (see below), whose sum is σ = 260055360. Its totient is φ = 37920960.

The previous prime is 121640383. The next prime is 121640437. The reversal of 121640394 is 493046121.

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 23 ways as a sum of consecutive naturals, for example, 192459 + ... + 193089.

It is an arithmetic number, because the mean of its divisors is an integer number (5417820).

Almost surely, 2^121640394 is an apocalyptic number.

121640394 is an abundant number, since it is smaller than the sum of its proper divisors (138414966).

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

121640394 is a wasteful number, since it uses less digits than its factorization.

121640394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763 (or 744 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 121640394 is about 11029.0704050704. The cubic root of 121640394 is about 495.4797837687.

The spelling of 121640394 in words is "one hundred twenty-one million, six hundred forty thousand, three hundred ninety-four".