721924042 has 32 divisors (see below), whose sum is σ = 1266347520. Its totient is φ = 302231040.

The previous prime is 721924031. The next prime is 721924067. The reversal of 721924042 is 240429127.

It is a junction number, because it is equal to n+sod(n) for n = 721923995 and 721924013.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 610692 + ... + 611872.

It is an arithmetic number, because the mean of its divisors is an integer number (39573360).

Almost surely, 2^721924042 is an apocalyptic number.

721924042 is a deficient number, since it is larger than the sum of its proper divisors (544423478).

721924042 is a wasteful number, since it uses less digits than its factorization.

721924042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 721924042 is about 26868.6442158885. The cubic root of 721924042 is about 897.0786105923.

The spelling of 721924042 in words is "seven hundred twenty-one million, nine hundred twenty-four thousand, forty-two".