51234440 has 32 divisors (see below), whose sum is σ = 115496280. Its totient is φ = 20454912.

The previous prime is 51234439. The next prime is 51234499. The reversal of 51234440 is 4443215.

It can be written as a sum of positive squares in 4 ways, for example, as 23755876 + 27478564 = 4874^2 + 5242^2 .

It is a super-2 number, since 2×51234440² = 5249935684227200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30092 + ... + 31748.

Almost surely, 2^51234440 is an apocalyptic number.

It is an amenable number.

51234440 is an abundant number, since it is smaller than the sum of its proper divisors (64261840).

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

51234440 is a wasteful number, since it uses less digits than its factorization.

51234440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2441 (or 2437 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 51234440 is about 7157.8236915979. The cubic root of 51234440 is about 371.4103465276.

Adding to 51234440 its reverse (4443215), we get a palindrome (55677655).

The spelling of 51234440 in words is "fifty-one million, two hundred thirty-four thousand, four hundred forty".