47398921 has 4 divisors (see below), whose sum is σ = 47428612. Its totient is φ = 47369232.

The previous prime is 47398919. The next prime is 47398979. The reversal of 47398921 is 12989374.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33223696 + 14175225 = 5764^2 + 3765^2 .

It is a cyclic number.

It is not a de Polignac number, because 47398921 - 2¹ = 47398919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47398991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12306 + ... + 15691.

It is an arithmetic number, because the mean of its divisors is an integer number (11857153).

Almost surely, 2^47398921 is an apocalyptic number.

It is an amenable number.

47398921 is a deficient number, since it is larger than the sum of its proper divisors (29691).

47398921 is a wasteful number, since it uses less digits than its factorization.

47398921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29690.

The product of its digits is 108864, while the sum is 43.

The square root of 47398921 is about 6884.6874293609. The cubic root of 47398921 is about 361.9007516652.

The spelling of 47398921 in words is "forty-seven million, three hundred ninety-eight thousand, nine hundred twenty-one".