840212545 has 8 divisors (see below), whose sum is σ = 1018650024. Its totient is φ = 665240064.

The previous prime is 840212537. The next prime is 840212557. The reversal of 840212545 is 545212048.

It can be written as a sum of positive squares in 4 ways, for example, as 13535041 + 826677504 = 3679^2 + 28752^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 840212545 - 2³ = 840212537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865714 + ... + 866683.

It is an arithmetic number, because the mean of its divisors is an integer number (127331253).

Almost surely, 2^840212545 is an apocalyptic number.

It is an amenable number.

840212545 is a deficient number, since it is larger than the sum of its proper divisors (178437479).

840212545 is a wasteful number, since it uses less digits than its factorization.

840212545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732499.

The product of its (nonzero) digits is 12800, while the sum is 31.

The square root of 840212545 is about 28986.4200100668. The cubic root of 840212545 is about 943.6183704844.

The spelling of 840212545 in words is "eight hundred forty million, two hundred twelve thousand, five hundred forty-five".