845640049 has 4 divisors (see below), whose sum is σ = 890147440. Its totient is φ = 801132660.

The previous prime is 845640043. The next prime is 845640067. The reversal of 845640049 is 940046548.

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 a cyclic number.

It is not a de Polignac number, because 845640049 - 2⁵ = 845640017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 845639993 and 845640020.

It is not an unprimeable number, because it can be changed into a prime (845640043) 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, 22253667 + ... + 22253704.

It is an arithmetic number, because the mean of its divisors is an integer number (222536860).

Almost surely, 2^845640049 is an apocalyptic number.

It is an amenable number.

845640049 is a deficient number, since it is larger than the sum of its proper divisors (44507391).

845640049 is a wasteful number, since it uses less digits than its factorization.

845640049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44507390.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 845640049 is about 29079.8908010329. The cubic root of 845640049 is about 945.6458353136.

The spelling of 845640049 in words is "eight hundred forty-five million, six hundred forty thousand, forty-nine".