51840386 has 8 divisors (see below), whose sum is σ = 83742204. Its totient is φ = 23926320.

The previous prime is 51840377. The next prime is 51840407. The reversal of 51840386 is 68304815.

It can be written as a sum of positive squares in 2 ways, for example, as 51768025 + 72361 = 7195^2 + 269^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 996905 + ... + 996956.

Almost surely, 2^51840386 is an apocalyptic number.

51840386 is a deficient number, since it is larger than the sum of its proper divisors (31901818).

51840386 is a wasteful number, since it uses less digits than its factorization.

51840386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993876.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 51840386 is about 7200.0268055057. The cubic root of 51840386 is about 372.8688261688.

It can be divided in two parts, 518 and 40386, that added together give a palindrome (40904).

The spelling of 51840386 in words is "fifty-one million, eight hundred forty thousand, three hundred eighty-six".