121984690 has 64 divisors (see below), whose sum is σ = 243855360. Its totient is φ = 43729920.

The previous prime is 121984657. The next prime is 121984691. The reversal of 121984690 is 96489121.

It is a super-2 number, since 2×121984690² = 29760529188792200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121984691) 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, 416184 + ... + 416476.

It is an arithmetic number, because the mean of its divisors is an integer number (3810240).

Almost surely, 2^121984690 is an apocalyptic number.

121984690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121984690 is a deficient number, since it is larger than the sum of its proper divisors (121870670).

121984690 is a wasteful number, since it uses less digits than its factorization.

121984690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 121984690 is about 11044.6679443069. The cubic root of 121984690 is about 495.9468188949.

The spelling of 121984690 in words is "one hundred twenty-one million, nine hundred eighty-four thousand, six hundred ninety".