851949 has 12 divisors (see below), whose sum is σ = 1406496. Its totient is φ = 486792.

The previous prime is 851899. The next prime is 851953. The reversal of 851949 is 949158.

It is not a de Polignac number, because 851949 - 2⁷ = 851821 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 851949.

It is not an unprimeable number, because it can be changed into a prime (851449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6699 + ... + 6824.

It is an arithmetic number, because the mean of its divisors is an integer number (117208).

2⁸⁵¹⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

851949 is a deficient number, since it is larger than the sum of its proper divisors (554547).

851949 is a wasteful number, since it uses less digits than its factorization.

851949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13536 (or 13533 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 851949 is about 923.0108341726. The cubic root of 851949 is about 94.7991694634.

The spelling of 851949 in words is "eight hundred fifty-one thousand, nine hundred forty-nine".