721469749 has 32 divisors (see below), whose sum is σ = 1025692416. Its totient is φ = 488401920.

The previous prime is 721469747. The next prime is 721469779. The reversal of 721469749 is 947964127.

It is a cyclic number.

It is not a de Polignac number, because 721469749 - 2¹ = 721469747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721469741) 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 31 ways as a sum of consecutive naturals, for example, 4182 + ... + 38215.

It is an arithmetic number, because the mean of its divisors is an integer number (32052888).

Almost surely, 2^721469749 is an apocalyptic number.

It is an amenable number.

721469749 is a deficient number, since it is larger than the sum of its proper divisors (304222667).

721469749 is a wasteful number, since it uses less digits than its factorization.

721469749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42445.

The product of its digits is 762048, while the sum is 49.

The square root of 721469749 is about 26860.1889233862. The cubic root of 721469749 is about 896.8903996336.

The spelling of 721469749 in words is "seven hundred twenty-one million, four hundred sixty-nine thousand, seven hundred forty-nine".