51386403 has 4 divisors (see below), whose sum is σ = 68515208. Its totient is φ = 34257600.

The previous prime is 51386389. The next prime is 51386459. The reversal of 51386403 is 30468315.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51386403 - 2⁸ = 51386147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51386473) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8564398 + ... + 8564403.

It is an arithmetic number, because the mean of its divisors is an integer number (17128802).

Almost surely, 2^51386403 is an apocalyptic number.

51386403 is a deficient number, since it is larger than the sum of its proper divisors (17128805).

51386403 is a wasteful number, since it uses less digits than its factorization.

51386403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17128804.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 51386403 is about 7168.4309998772. The cubic root of 51386403 is about 371.7771890960. Note that the first 3 decimals are identical.

The spelling of 51386403 in words is "fifty-one million, three hundred eighty-six thousand, four hundred three".