721365003 has 12 divisors (see below), whose sum is σ = 1051711128. Its totient is φ = 476414880.

The previous prime is 721364951. The next prime is 721365067. The reversal of 721365003 is 300563127.

It is a happy number.

721365003 is a `hidden beast` number, since 7 + 2 + 1 + 3 + 650 + 0 + 3 = 666.

It is not a de Polignac number, because 721365003 - 2¹⁴ = 721348619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721365503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 373578 + ... + 375503.

It is an arithmetic number, because the mean of its divisors is an integer number (87642594).

Almost surely, 2^721365003 is an apocalyptic number.

721365003 is a deficient number, since it is larger than the sum of its proper divisors (330346125).

721365003 is a wasteful number, since it uses less digits than its factorization.

721365003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749194 (or 749191 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 721365003 is about 26858.2390152445. The cubic root of 721365003 is about 896.8469927646.

The spelling of 721365003 in words is "seven hundred twenty-one million, three hundred sixty-five thousand, three".