47781842 has 4 divisors (see below), whose sum is σ = 71672766. Its totient is φ = 23890920.

The previous prime is 47781829. The next prime is 47781847. The reversal of 47781842 is 24818774.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24818774 = 2 ⋅12409387.

It can be written as a sum of positive squares in only one way, i.e., 45711121 + 2070721 = 6761^2 + 1439^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 47781842.

It is not an unprimeable number, because it can be changed into a prime (47781847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11945459 + ... + 11945462.

Almost surely, 2^47781842 is an apocalyptic number.

47781842 is a deficient number, since it is larger than the sum of its proper divisors (23890924).

47781842 is a wasteful number, since it uses less digits than its factorization.

47781842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23890923.

The product of its digits is 100352, while the sum is 41.

The square root of 47781842 is about 6912.4411028232. The cubic root of 47781842 is about 362.8726998370.

The spelling of 47781842 in words is "forty-seven million, seven hundred eighty-one thousand, eight hundred forty-two".