851408 has 20 divisors (see below), whose sum is σ = 1666560. Its totient is φ = 421344.

The previous prime is 851401. The next prime is 851413. The reversal of 851408 is 804158.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (851401) by changing a digit.

851408 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1823 + ... + 2241.

It is an arithmetic number, because the mean of its divisors is an integer number (83328).

2⁸⁵¹⁴⁰⁸ is an apocalyptic number.

It is an amenable number.

851408 is a deficient number, since it is larger than the sum of its proper divisors (815152).

851408 is a wasteful number, since it uses less digits than its factorization.

851408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 851408 is about 922.7177249842. The cubic root of 851408 is about 94.7790989309.

The spelling of 851408 in words is "eight hundred fifty-one thousand, four hundred eight".