121698406 has 4 divisors (see below), whose sum is σ = 182547612. Its totient is φ = 60849202.

The previous prime is 121698397. The next prime is 121698419. The reversal of 121698406 is 604896121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30424600 + ... + 30424603.

It is an arithmetic number, because the mean of its divisors is an integer number (45636903).

Almost surely, 2^121698406 is an apocalyptic number.

121698406 is a deficient number, since it is larger than the sum of its proper divisors (60849206).

121698406 is an equidigital number, since it uses as much as digits as its factorization.

121698406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60849205.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 121698406 is about 11031.7000503096. The cubic root of 121698406 is about 495.5585383228.

The spelling of 121698406 in words is "one hundred twenty-one million, six hundred ninety-eight thousand, four hundred six".