121636400 has 30 divisors (see below), whose sum is σ = 292232412. Its totient is φ = 48654400.

The previous prime is 121636399. The next prime is 121636429. The reversal of 121636400 is 4636121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 151646 + ... + 152445.

Almost surely, 2^121636400 is an apocalyptic number.

121636400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121636400 is an abundant number, since it is smaller than the sum of its proper divisors (170596012).

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

121636400 is a wasteful number, since it uses less digits than its factorization.

121636400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304109 (or 304098 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 121636400 is about 11028.8893366467. The cubic root of 121636400 is about 495.4743607677.

The spelling of 121636400 in words is "one hundred twenty-one million, six hundred thirty-six thousand, four hundred".