51859404 has 54 divisors (see below), whose sum is σ = 135544500. Its totient is φ = 16717680.

The previous prime is 51859403. The next prime is 51859421. The reversal of 51859404 is 40495815.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51859403) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 33847 + ... + 35345.

Almost surely, 2^51859404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51859404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67772250).

51859404 is an abundant number, since it is smaller than the sum of its proper divisors (83685096).

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

51859404 is a wasteful number, since it uses less digits than its factorization.

51859404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571 (or 1535 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 51859404 is about 7201.3473739294. The cubic root of 51859404 is about 372.9144170867.

The spelling of 51859404 in words is "fifty-one million, eight hundred fifty-nine thousand, four hundred four".