849995389 has 4 divisors (see below), whose sum is σ = 850117756. Its totient is φ = 849873024.

The previous prime is 849995387. The next prime is 849995401. The reversal of 849995389 is 983599948.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 532086489 + 317908900 = 23067^2 + 17830^2 .

It is a cyclic number.

It is not a de Polignac number, because 849995389 - 2¹ = 849995387 is a prime.

It is a super-2 number, since 2×849995389² = 1444984322642522642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 849995389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (849995387) 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, 50094 + ... + 64879.

It is an arithmetic number, because the mean of its divisors is an integer number (212529439).

Almost surely, 2^849995389 is an apocalyptic number.

It is an amenable number.

849995389 is a deficient number, since it is larger than the sum of its proper divisors (122367).

849995389 is a wasteful number, since it uses less digits than its factorization.

849995389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122366.

The product of its digits is 25194240, while the sum is 64.

The square root of 849995389 is about 29154.6803961216. The cubic root of 849995389 is about 947.2665242990.

The spelling of 849995389 in words is "eight hundred forty-nine million, nine hundred ninety-five thousand, three hundred eighty-nine".