51863140 has 24 divisors (see below), whose sum is σ = 124471872. Its totient is φ = 17781600.

The previous prime is 51863129. The next prime is 51863143. The reversal of 51863140 is 4136815.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 51863099 and 51863108.

It is not an unprimeable number, because it can be changed into a prime (51863143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185086 + ... + 185365.

It is an arithmetic number, because the mean of its divisors is an integer number (5186328).

Almost surely, 2^51863140 is an apocalyptic number.

It is an amenable number.

51863140 is an abundant number, since it is smaller than the sum of its proper divisors (72608732).

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

51863140 is a wasteful number, since it uses less digits than its factorization.

51863140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370467 (or 370465 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 51863140 is about 7201.6067651601. The cubic root of 51863140 is about 372.9233719062.

Adding to 51863140 its reverse (4136815), we get a palindrome (55999955).

It can be divided in two parts, 518631 and 40, that added together give a triangular number (518671 = T₁₀₁₈).

The spelling of 51863140 in words is "fifty-one million, eight hundred sixty-three thousand, one hundred forty".