840456037 has 2 divisors, whose sum is σ = 840456038. Its totient is φ = 840456036.

The previous prime is 840455981. The next prime is 840456061. The reversal of 840456037 is 730654048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 781258401 + 59197636 = 27951^2 + 7694^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840456037 is a prime.

It is equal to p_43117597 and since 840456037 and 43117597 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 840455987 and 840456005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840456137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420228018 + 420228019.

It is an arithmetic number, because the mean of its divisors is an integer number (420228019).

Almost surely, 2^840456037 is an apocalyptic number.

It is an amenable number.

840456037 is a deficient number, since it is larger than the sum of its proper divisors (1).

840456037 is an equidigital number, since it uses as much as digits as its factorization.

840456037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 840456037 is about 28990.6198105525. The cubic root of 840456037 is about 943.7095146178.

The spelling of 840456037 in words is "eight hundred forty million, four hundred fifty-six thousand, thirty-seven".