51940440 has 320 divisors, whose sum is σ = 197588160. Its totient is φ = 12165120.

The previous prime is 51940387. The next prime is 51940451. The reversal of 51940440 is 4404915.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1266820 + ... + 1266860.

It is an arithmetic number, because the mean of its divisors is an integer number (617463).

Almost surely, 2^51940440 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 51940440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98794080).

51940440 is an abundant number, since it is smaller than the sum of its proper divisors (145647720).

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

51940440 is a wasteful number, since it uses less digits than its factorization.

51940440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 51940440 is about 7206.9716247534. The cubic root of 51940440 is about 373.1085558774.

The spelling of 51940440 in words is "fifty-one million, nine hundred forty thousand, four hundred forty".