51394590 has 144 divisors (see below), whose sum is σ = 150733440. Its totient is φ = 12130560.

The previous prime is 51394579. The next prime is 51394613. The reversal of 51394590 is 9549315.

51394590 is a `hidden beast` number, since 513 + 94 + 59 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 471456 + ... + 471564.

It is an arithmetic number, because the mean of its divisors is an integer number (1046760).

Almost surely, 2^51394590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51394590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75366720).

51394590 is an abundant number, since it is smaller than the sum of its proper divisors (99338850).

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

51394590 is a wasteful number, since it uses less digits than its factorization.

51394590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 51394590 is about 7169.0020225970. The cubic root of 51394590 is about 371.7969321800.

It can be divided in two parts, 51394 and 590, that added together give a square (51984 = 228²).

The spelling of 51394590 in words is "fifty-one million, three hundred ninety-four thousand, five hundred ninety".