721437145 has 32 divisors (see below), whose sum is σ = 1019975040. Its totient is φ = 482941440.

The previous prime is 721437139. The next prime is 721437151. The reversal of 721437145 is 541734127.

It is an interprime number because it is at equal distance from previous prime (721437139) and next prime (721437151).

It is not a de Polignac number, because 721437145 - 2²¹ = 719339993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721437145.

It is an unprimeable number.

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, 291202 + ... + 293668.

It is an arithmetic number, because the mean of its divisors is an integer number (31874220).

Almost surely, 2^721437145 is an apocalyptic number.

It is an amenable number.

721437145 is a deficient number, since it is larger than the sum of its proper divisors (298537895).

721437145 is a wasteful number, since it uses less digits than its factorization.

721437145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905.

The product of its digits is 23520, while the sum is 34.

The square root of 721437145 is about 26859.5819960028. The cubic root of 721437145 is about 896.8768889470.

The spelling of 721437145 in words is "seven hundred twenty-one million, four hundred thirty-seven thousand, one hundred forty-five".