840720743 has 2 divisors, whose sum is σ = 840720744. Its totient is φ = 840720742.

The previous prime is 840720731. The next prime is 840720763. The reversal of 840720743 is 347027048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840720743 - 2²⁰ = 839672167 is a prime.

It is a super-2 number, since 2×840720743² = 1413622735420944098, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840720763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420360371 + 420360372.

It is an arithmetic number, because the mean of its divisors is an integer number (420360372).

Almost surely, 2^840720743 is an apocalyptic number.

840720743 is a deficient number, since it is larger than the sum of its proper divisors (1).

840720743 is an equidigital number, since it uses as much as digits as its factorization.

840720743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 840720743 is about 28995.1848243808. The cubic root of 840720743 is about 943.8085796248.

The spelling of 840720743 in words is "eight hundred forty million, seven hundred twenty thousand, seven hundred forty-three".