51694398 has 48 divisors (see below), whose sum is σ = 130437216. Its totient is φ = 14489280.

The previous prime is 51694393. The next prime is 51694417. The reversal of 51694398 is 89349615.

It is a happy number.

51694398 is a `hidden beast` number, since 516 + 9 + 43 + 98 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51694393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2808 + ... + 10548.

It is an arithmetic number, because the mean of its divisors is an integer number (2717442).

Almost surely, 2^51694398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51694398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65218608).

51694398 is an abundant number, since it is smaller than the sum of its proper divisors (78742818).

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

51694398 is a wasteful number, since it uses less digits than its factorization.

51694398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7809 (or 7806 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 51694398 is about 7189.8816401941. The cubic root of 51694398 is about 372.5184844363.

The spelling of 51694398 in words is "fifty-one million, six hundred ninety-four thousand, three hundred ninety-eight".