51383430 has 128 divisors (see below), whose sum is σ = 161832960. Its totient is φ = 11352960.

The previous prime is 51383419. The next prime is 51383441. The reversal of 51383430 is 3438315.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51383419) and next prime (51383441).

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

It is a junction number, because it is equal to n+sod(n) for n = 51383394 and 51383403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58152 + ... + 59028.

It is an arithmetic number, because the mean of its divisors is an integer number (1264320).

Almost surely, 2^51383430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51383430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80916480).

51383430 is an abundant number, since it is smaller than the sum of its proper divisors (110449530).

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

51383430 is a wasteful number, since it uses less digits than its factorization.

51383430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931 (or 925 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 51383430 is about 7168.2236293241. The cubic root of 51383430 is about 371.7700191390.

The spelling of 51383430 in words is "fifty-one million, three hundred eighty-three thousand, four hundred thirty".