721738143 has 24 divisors (see below), whose sum is σ = 1192289696. Its totient is φ = 412128000.

The previous prime is 721738133. The next prime is 721738151. The reversal of 721738143 is 341837127.

It is not a de Polignac number, because 721738143 - 2¹² = 721734047 is a prime.

It is a super-2 number, since 2×721738143² = 1041811894122176898, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721738098 and 721738107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721738133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110283 + ... + 116643.

Almost surely, 2^721738143 is an apocalyptic number.

721738143 is a deficient number, since it is larger than the sum of its proper divisors (470551553).

721738143 is a wasteful number, since it uses less digits than its factorization.

721738143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8175 (or 8172 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 721738143 is about 26865.1845889806. The cubic root of 721738143 is about 897.0016032603.

The spelling of 721738143 in words is "seven hundred twenty-one million, seven hundred thirty-eight thousand, one hundred forty-three".