47851438 has 4 divisors (see below), whose sum is σ = 71777160. Its totient is φ = 23925718.

The previous prime is 47851423. The next prime is 47851451. The reversal of 47851438 is 83415874.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83415874 = 2 ⋅41707937.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 47851438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11962858 + ... + 11962861.

It is an arithmetic number, because the mean of its divisors is an integer number (17944290).

Almost surely, 2^47851438 is an apocalyptic number.

47851438 is a deficient number, since it is larger than the sum of its proper divisors (23925722).

47851438 is a wasteful number, since it uses less digits than its factorization.

47851438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23925721.

The product of its digits is 107520, while the sum is 40.

The square root of 47851438 is about 6917.4733826738. The cubic root of 47851438 is about 363.0487934876.

The spelling of 47851438 in words is "forty-seven million, eight hundred fifty-one thousand, four hundred thirty-eight".