121239686 has 8 divisors (see below), whose sum is σ = 182640744. Its totient is φ = 60359440.

The previous prime is 121239683. The next prime is 121239689. The reversal of 121239686 is 686932121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121239683) and next prime (121239689).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×121239686² = 29398122922757192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121239683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129620 + ... + 130551.

It is an arithmetic number, because the mean of its divisors is an integer number (22830093).

Almost surely, 2^121239686 is an apocalyptic number.

121239686 is a deficient number, since it is larger than the sum of its proper divisors (61401058).

121239686 is a wasteful number, since it uses less digits than its factorization.

121239686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260406.

The product of its digits is 31104, while the sum is 38.

The square root of 121239686 is about 11010.8894281979. The cubic root of 121239686 is about 494.9351151221.

The spelling of 121239686 in words is "one hundred twenty-one million, two hundred thirty-nine thousand, six hundred eighty-six".