721501442 has 8 divisors (see below), whose sum is σ = 1100595600. Its totient is φ = 354636244.

The previous prime is 721501441. The next prime is 721501463. The reversal of 721501442 is 244105127.

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

It is not an unprimeable number, because it can be changed into a prime (721501441) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3057092 + ... + 3057327.

It is an arithmetic number, because the mean of its divisors is an integer number (137574450).

Almost surely, 2^721501442 is an apocalyptic number.

721501442 is a deficient number, since it is larger than the sum of its proper divisors (379094158).

721501442 is a wasteful number, since it uses less digits than its factorization.

721501442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6114480.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 721501442 is about 26860.7788792507. The cubic root of 721501442 is about 896.9035324232.

Adding to 721501442 its reverse (244105127), we get a palindrome (965606569).

The spelling of 721501442 in words is "seven hundred twenty-one million, five hundred one thousand, four hundred forty-two".