840452665 has 8 divisors (see below), whose sum is σ = 1086123528. Its totient is φ = 620641920.

The previous prime is 840452663. The next prime is 840452677. The reversal of 840452665 is 566254048.

It can be written as a sum of positive squares in 4 ways, for example, as 48818169 + 791634496 = 6987^2 + 28136^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 840452665 - 2¹ = 840452663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840452663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6464956 + ... + 6465085.

It is an arithmetic number, because the mean of its divisors is an integer number (135765441).

Almost surely, 2^840452665 is an apocalyptic number.

It is an amenable number.

840452665 is a deficient number, since it is larger than the sum of its proper divisors (245670863).

840452665 is a wasteful number, since it uses less digits than its factorization.

840452665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12930059.

The product of its (nonzero) digits is 230400, while the sum is 40.

The square root of 840452665 is about 28990.5616537521. The cubic root of 840452665 is about 943.7082525281.

The spelling of 840452665 in words is "eight hundred forty million, four hundred fifty-two thousand, six hundred sixty-five".