122721804 has 36 divisors (see below), whose sum is σ = 321705384. Its totient is φ = 40906944.

The previous prime is 122721791. The next prime is 122721811. The reversal of 122721804 is 408127221.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62157 + ... + 64100.

Almost surely, 2^122721804 is an apocalyptic number.

It is an amenable number.

122721804 is an abundant number, since it is smaller than the sum of its proper divisors (198983580).

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

122721804 is a wasteful number, since it uses less digits than its factorization.

122721804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126276 (or 126262 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 122721804 is about 11077.9873623326. The cubic root of 122721804 is about 496.9437622173.

The spelling of 122721804 in words is "one hundred twenty-two million, seven hundred twenty-one thousand, eight hundred four".