47389978 has 4 divisors (see below), whose sum is σ = 71084970. Its totient is φ = 23694988.

The previous prime is 47389961. The next prime is 47389981. The reversal of 47389978 is 87998374.

47389978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87998374 = 2 ⋅43999187.

It can be written as a sum of positive squares in only one way, i.e., 46335249 + 1054729 = 6807^2 + 1027^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11847493 + ... + 11847496.

Almost surely, 2^47389978 is an apocalyptic number.

47389978 is a deficient number, since it is larger than the sum of its proper divisors (23694992).

47389978 is a wasteful number, since it uses less digits than its factorization.

47389978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23694991.

The product of its digits is 3048192, while the sum is 55.

The square root of 47389978 is about 6884.0379138991. The cubic root of 47389978 is about 361.8779896703.

The spelling of 47389978 in words is "forty-seven million, three hundred eighty-nine thousand, nine hundred seventy-eight".