721742143 has 16 divisors (see below), whose sum is σ = 750182400. Its totient is φ = 693929376.

The previous prime is 721742137. The next prime is 721742159. The reversal of 721742143 is 341247127.

It is a cyclic number.

It is not a de Polignac number, because 721742143 - 2¹⁷ = 721611071 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 (721742173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 813246 + ... + 814132.

It is an arithmetic number, because the mean of its divisors is an integer number (46886400).

Almost surely, 2^721742143 is an apocalyptic number.

721742143 is a deficient number, since it is larger than the sum of its proper divisors (28440257).

721742143 is a wasteful number, since it uses less digits than its factorization.

721742143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206.

The product of its digits is 9408, while the sum is 31.

The square root of 721742143 is about 26865.2590346715. The cubic root of 721742143 is about 897.0032603709.

The spelling of 721742143 in words is "seven hundred twenty-one million, seven hundred forty-two thousand, one hundred forty-three".