721929147 has 12 divisors (see below), whose sum is σ = 994628520. Its totient is φ = 465758880.

The previous prime is 721929121. The next prime is 721929199. The reversal of 721929147 is 741929127.

It is not a de Polignac number, because 721929147 - 2⁸ = 721928891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 721929099 and 721929108.

It is not an unprimeable number, because it can be changed into a prime (721929547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122322 + ... + 128087.

It is an arithmetic number, because the mean of its divisors is an integer number (82885710).

Almost surely, 2^721929147 is an apocalyptic number.

721929147 is a deficient number, since it is larger than the sum of its proper divisors (272699373).

721929147 is a wasteful number, since it uses less digits than its factorization.

721929147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250474 (or 250443 counting only the distinct ones).

The product of its digits is 63504, while the sum is 42.

The square root of 721929147 is about 26868.7392149315. The cubic root of 721929147 is about 897.0807251155.

The spelling of 721929147 in words is "seven hundred twenty-one million, nine hundred twenty-nine thousand, one hundred forty-seven".