851388 has 12 divisors (see below), whose sum is σ = 1986600. Its totient is φ = 283792.

The previous prime is 851387. The next prime is 851393. The reversal of 851388 is 883158.

It is a tau number, because it is divible by the number of its divisors (12).

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 851388.

It is not an unprimeable number, because it can be changed into a prime (851381) 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, 35463 + ... + 35486.

It is an arithmetic number, because the mean of its divisors is an integer number (165550).

2⁸⁵¹³⁸⁸ is an apocalyptic number.

It is an amenable number.

851388 is an abundant number, since it is smaller than the sum of its proper divisors (1135212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

851388 is a wasteful number, since it uses less digits than its factorization.

851388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70956 (or 70954 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 851388 is about 922.7068873700. The cubic root of 851388 is about 94.7783567889.

The spelling of 851388 in words is "eight hundred fifty-one thousand, three hundred eighty-eight".