51400818 has 96 divisors (see below), whose sum is σ = 136805760. Its totient is φ = 14152320.

The previous prime is 51400813. The next prime is 51400861. The reversal of 51400818 is 81800415.

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

It is a junction number, because it is equal to n+sod(n) for n = 51400791 and 51400800.

It is not an unprimeable number, because it can be changed into a prime (51400813) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98398 + ... + 98918.

It is an arithmetic number, because the mean of its divisors is an integer number (1425060).

Almost surely, 2^51400818 is an apocalyptic number.

51400818 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51400818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68402880).

51400818 is an abundant number, since it is smaller than the sum of its proper divisors (85404942).

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

51400818 is a wasteful number, since it uses less digits than its factorization.

51400818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574 (or 562 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 51400818 is about 7169.4363795211. The cubic root of 51400818 is about 371.8119496995.

The spelling of 51400818 in words is "fifty-one million, four hundred thousand, eight hundred eighteen".