121986398 has 16 divisors (see below), whose sum is σ = 188501040. Its totient is φ = 59169600.

The previous prime is 121986391. The next prime is 121986413. The reversal of 121986398 is 893689121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121986391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10733 + ... + 18951.

It is an arithmetic number, because the mean of its divisors is an integer number (11781315).

Almost surely, 2^121986398 is an apocalyptic number.

121986398 is a deficient number, since it is larger than the sum of its proper divisors (66514642).

121986398 is a wasteful number, since it uses less digits than its factorization.

121986398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8443.

The product of its digits is 186624, while the sum is 47.

The square root of 121986398 is about 11044.7452664152. The cubic root of 121986398 is about 495.9491335931.

The spelling of 121986398 in words is "one hundred twenty-one million, nine hundred eighty-six thousand, three hundred ninety-eight".