721384156 has 12 divisors (see below), whose sum is σ = 1274221368. Its totient is φ = 357320912.

The previous prime is 721384151. The next prime is 721384159. The reversal of 721384156 is 651483127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721384151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842311 + ... + 843166.

It is an arithmetic number, because the mean of its divisors is an integer number (106185114).

Almost surely, 2^721384156 is an apocalyptic number.

It is an amenable number.

721384156 is a deficient number, since it is larger than the sum of its proper divisors (552837212).

721384156 is a wasteful number, since it uses less digits than its factorization.

721384156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685588 (or 1685586 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 721384156 is about 26858.5955701336. The cubic root of 721384156 is about 896.8549301049.

The spelling of 721384156 in words is "seven hundred twenty-one million, three hundred eighty-four thousand, one hundred fifty-six".