721267949 has 8 divisors (see below), whose sum is σ = 761708640. Its totient is φ = 681075216.

The previous prime is 721267909. The next prime is 721267999. The reversal of 721267949 is 949762127.

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

It is not a de Polignac number, because 721267949 - 2⁸ = 721267693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721267909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55994 + ... + 67659.

It is an arithmetic number, because the mean of its divisors is an integer number (95213580).

Almost surely, 2^721267949 is an apocalyptic number.

It is an amenable number.

721267949 is a deficient number, since it is larger than the sum of its proper divisors (40440691).

721267949 is a wasteful number, since it uses less digits than its factorization.

721267949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123979.

The product of its digits is 381024, while the sum is 47.

The square root of 721267949 is about 26856.4321718280. The cubic root of 721267949 is about 896.8067697191.

The spelling of 721267949 in words is "seven hundred twenty-one million, two hundred sixty-seven thousand, nine hundred forty-nine".