51402384 has 160 divisors (see below), whose sum is σ = 166953600. Its totient is φ = 14999040.

The previous prime is 51402359. The next prime is 51402389. The reversal of 51402384 is 48320415.

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

It is not an unprimeable number, because it can be changed into a prime (51402389) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137622 + ... + 137994.

It is an arithmetic number, because the mean of its divisors is an integer number (1043460).

Almost surely, 2^51402384 is an apocalyptic number.

51402384 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51402384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83476800).

51402384 is an abundant number, since it is smaller than the sum of its proper divisors (115551216).

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

51402384 is a wasteful number, since it uses less digits than its factorization.

51402384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 51402384 is about 7169.5455922952. The cubic root of 51402384 is about 371.8157255901.

Adding to 51402384 its reverse (48320415), we get a palindrome (99722799).

The spelling of 51402384 in words is "fifty-one million, four hundred two thousand, three hundred eighty-four".