51959394 has 40 divisors (see below), whose sum is σ = 119151120. Its totient is φ = 16914744.

The previous prime is 51959363. The next prime is 51959407. The reversal of 51959394 is 49395915.

It is a happy number.

51959394 is a `hidden beast` number, since 51 + 9 + 593 + 9 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3237 + ... + 10695.

It is an arithmetic number, because the mean of its divisors is an integer number (2978778).

Almost surely, 2^51959394 is an apocalyptic number.

51959394 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51959394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59575560).

51959394 is an abundant number, since it is smaller than the sum of its proper divisors (67191726).

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

51959394 is a wasteful number, since it uses less digits than its factorization.

51959394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7516 (or 7507 counting only the distinct ones).

The product of its digits is 218700, while the sum is 45.

The square root of 51959394 is about 7208.2864815433. The cubic root of 51959394 is about 373.1539350304.

The spelling of 51959394 in words is "fifty-one million, nine hundred fifty-nine thousand, three hundred ninety-four".