840726057 has 4 divisors (see below), whose sum is σ = 1120968080. Its totient is φ = 560484036.

The previous prime is 840726031. The next prime is 840726059. The reversal of 840726057 is 750627048.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 840726057 - 2¹¹ = 840724009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840726059) 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, 140121007 + ... + 140121012.

It is an arithmetic number, because the mean of its divisors is an integer number (280242020).

Almost surely, 2^840726057 is an apocalyptic number.

It is an amenable number.

840726057 is a deficient number, since it is larger than the sum of its proper divisors (280242023).

840726057 is a wasteful number, since it uses less digits than its factorization.

840726057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280242022.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 840726057 is about 28995.2764601409. The cubic root of 840726057 is about 943.8105681520.

Subtracting from 840726057 its reverse (750627048), we obtain a palindrome (90099009).

The spelling of 840726057 in words is "eight hundred forty million, seven hundred twenty-six thousand, fifty-seven".