51423930 has 64 divisors (see below), whose sum is σ = 137819520. Its totient is φ = 13644288.

The previous prime is 51423913. The next prime is 51423941. The reversal of 51423930 is 3932415.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51423894 and 51423903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76074 + ... + 76746.

It is an arithmetic number, because the mean of its divisors is an integer number (2153430).

Almost surely, 2^51423930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51423930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68909760).

51423930 is an abundant number, since it is smaller than the sum of its proper divisors (86395590).

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

51423930 is a wasteful number, since it uses less digits than its factorization.

51423930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972 (or 966 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 51423930 is about 7171.0480405586. The cubic root of 51423930 is about 371.8676688525.

The spelling of 51423930 in words is "fifty-one million, four hundred twenty-three thousand, nine hundred thirty".