51400416 has 48 divisors (see below), whose sum is σ = 135402624. Its totient is φ = 17073024.

The previous prime is 51400411. The next prime is 51400421. The reversal of 51400416 is 61400415.

It is an interprime number because it is at equal distance from previous prime (51400411) and next prime (51400421).

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 51400392 and 51400401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51400411) 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, 32541 + ... + 34083.

It is an arithmetic number, because the mean of its divisors is an integer number (2820888).

Almost surely, 2^51400416 is an apocalyptic number.

It is an amenable number.

51400416 is an abundant number, since it is smaller than the sum of its proper divisors (84002208).

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

51400416 is a wasteful number, since it uses less digits than its factorization.

51400416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903 (or 1895 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 51400416 is about 7169.4083437896. The cubic root of 51400416 is about 371.8109803972.

Subtracting 51400416 from its reverse (61400415), we obtain a palindrome (9999999).

The spelling of 51400416 in words is "fifty-one million, four hundred thousand, four hundred sixteen".