840726437 has 2 divisors, whose sum is σ = 840726438. Its totient is φ = 840726436.

The previous prime is 840726431. The next prime is 840726457. The reversal of 840726437 is 734627048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 424607236 + 416119201 = 20606^2 + 20399^2 .

It is a cyclic number.

It is not a de Polignac number, because 840726437 - 2⁶ = 840726373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840726394 and 840726403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840726431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420363218 + 420363219.

It is an arithmetic number, because the mean of its divisors is an integer number (420363219).

Almost surely, 2^840726437 is an apocalyptic number.

It is an amenable number.

840726437 is a deficient number, since it is larger than the sum of its proper divisors (1).

840726437 is an equidigital number, since it uses as much as digits as its factorization.

840726437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 41.

The square root of 840726437 is about 28995.2830129316. The cubic root of 840726437 is about 943.8107103497.

It can be divided in two parts, 84072 and 6437, that added together give a palindrome (90509).

The spelling of 840726437 in words is "eight hundred forty million, seven hundred twenty-six thousand, four hundred thirty-seven".