19999947 has 8 divisors (see below), whose sum is σ = 29090880. Its totient is φ = 12121160.

The previous prime is 19999927. The next prime is 19999963. The reversal of 19999947 is 74999991.

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 19999947 - 2¹² = 19995851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19999927) 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, 302997 + ... + 303062.

It is an arithmetic number, because the mean of its divisors is an integer number (3636360).

Almost surely, 2^19999947 is an apocalyptic number.

19999947 is a deficient number, since it is larger than the sum of its proper divisors (9090933).

19999947 is a wasteful number, since it uses less digits than its factorization.

19999947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606073.

The product of its digits is 1653372, while the sum is 57.

The square root of 19999947 is about 4472.1300294155. The cubic root of 19999947 is about 271.4415218857.

The spelling of 19999947 in words is "nineteen million, nine hundred ninety-nine thousand, nine hundred forty-seven".