51421692 has 48 divisors (see below), whose sum is σ = 138200832. Its totient is φ = 14576640.

The previous prime is 51421687. The next prime is 51421703. The reversal of 51421692 is 29612415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8668 + ... + 13340.

It is an arithmetic number, because the mean of its divisors is an integer number (2879184).

Almost surely, 2^51421692 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 51421692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69100416).

51421692 is an abundant number, since it is smaller than the sum of its proper divisors (86779140).

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

51421692 is a wasteful number, since it uses less digits than its factorization.

51421692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4818 (or 4816 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 51421692 is about 7170.8919947242. The cubic root of 51421692 is about 371.8622741402.

The spelling of 51421692 in words is "fifty-one million, four hundred twenty-one thousand, six hundred ninety-two".