721401743 has 4 divisors (see below), whose sum is σ = 723445728. Its totient is φ = 719357760.

The previous prime is 721401649. The next prime is 721401773. The reversal of 721401743 is 347104127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 347104127 = 43 ⋅8072189.

It is a cyclic number.

It is not a de Polignac number, because 721401743 - 2¹² = 721397647 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 (721401773) 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, 1021463 + ... + 1022168.

It is an arithmetic number, because the mean of its divisors is an integer number (180861432).

Almost surely, 2^721401743 is an apocalyptic number.

721401743 is a deficient number, since it is larger than the sum of its proper divisors (2043985).

721401743 is a wasteful number, since it uses less digits than its factorization.

721401743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043984.

The product of its (nonzero) digits is 4704, while the sum is 29.

The square root of 721401743 is about 26858.9229679822. The cubic root of 721401743 is about 896.8622183434.

The spelling of 721401743 in words is "seven hundred twenty-one million, four hundred one thousand, seven hundred forty-three".