51140040 has 128 divisors (see below), whose sum is σ = 183029760. Its totient is φ = 11176704.

The previous prime is 51140009. The next prime is 51140069. The reversal of 51140040 is 4004115.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 31 ways as a sum of consecutive naturals, for example, 17997 + ... + 20643.

It is an arithmetic number, because the mean of its divisors is an integer number (1429920).

Almost surely, 2^51140040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51140040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91514880).

51140040 is an abundant number, since it is smaller than the sum of its proper divisors (131889720).

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

51140040 is a wasteful number, since it uses less digits than its factorization.

51140040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691 (or 2687 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 51140040 is about 7151.2264682361. The cubic root of 51140040 is about 371.1820971164.

Adding to 51140040 its reverse (4004115), we get a palindrome (55144155).

The spelling of 51140040 in words is "fifty-one million, one hundred forty thousand, forty".