47781914 has 4 divisors (see below), whose sum is σ = 71672874. Its totient is φ = 23890956.

The previous prime is 47781913. The next prime is 47781919. The reversal of 47781914 is 41918774.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41918774 = 2 ⋅20959387.

It can be written as a sum of positive squares in only one way, i.e., 46689889 + 1092025 = 6833^2 + 1045^2 .

It is a super-2 number, since 2×47781914² = 4566222611006792, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (47781913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11945477 + ... + 11945480.

Almost surely, 2^47781914 is an apocalyptic number.

47781914 is a deficient number, since it is larger than the sum of its proper divisors (23890960).

47781914 is a wasteful number, since it uses less digits than its factorization.

47781914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23890959.

The product of its digits is 56448, while the sum is 41.

The square root of 47781914 is about 6912.4463108222. The cubic root of 47781914 is about 362.8728821016.

The spelling of 47781914 in words is "forty-seven million, seven hundred eighty-one thousand, nine hundred fourteen".