47991889 has 8 divisors (see below), whose sum is σ = 52411968. Its totient is φ = 43581360.

The previous prime is 47991887. The next prime is 47991893. The reversal of 47991889 is 98819974.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 47991889 - 2¹ = 47991887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47991883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11844 + ... + 15370.

It is an arithmetic number, because the mean of its divisors is an integer number (6551496).

Almost surely, 2^47991889 is an apocalyptic number.

It is an amenable number.

47991889 is a deficient number, since it is larger than the sum of its proper divisors (4420079).

47991889 is a wasteful number, since it uses less digits than its factorization.

47991889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775.

The product of its digits is 1306368, while the sum is 55.

The square root of 47991889 is about 6927.6178445408. The cubic root of 47991889 is about 363.4036470451.

It can be divided in two parts, 47 and 991889, that added together give a triangular number (991936 = T₁₄₀₈).

The spelling of 47991889 in words is "forty-seven million, nine hundred ninety-one thousand, eight hundred eighty-nine".