121706816 has 56 divisors (see below), whose sum is σ = 301118016. Its totient is φ = 47416320.

The previous prime is 121706803. The next prime is 121706821. The reversal of 121706816 is 618607121.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7421 + ... + 17276.

Almost surely, 2^121706816 is an apocalyptic number.

121706816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121706816 is an abundant number, since it is smaller than the sum of its proper divisors (179411200).

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

121706816 is a wasteful number, since it uses less digits than its factorization.

121706816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24727 (or 24717 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 121706816 is about 11032.0812179751. The cubic root of 121706816 is about 495.5699532938.

The spelling of 121706816 in words is "one hundred twenty-one million, seven hundred six thousand, eight hundred sixteen".