19990347 has 8 divisors (see below), whose sum is σ = 28704144. Its totient is φ = 12301728.

The previous prime is 19990307. The next prime is 19990349. The reversal of 19990347 is 74309991.

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

It is not a de Polignac number, because 19990347 - 2¹² = 19986251 is a prime.

It is a super-2 number, since 2×19990347² = 799227946360818, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19990299 and 19990308.

It is not an unprimeable number, because it can be changed into a prime (19990349) 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 in 7 ways as a sum of consecutive naturals, for example, 256248 + ... + 256325.

It is an arithmetic number, because the mean of its divisors is an integer number (3588018).

Almost surely, 2^19990347 is an apocalyptic number.

19990347 is a deficient number, since it is larger than the sum of its proper divisors (8713797).

19990347 is a wasteful number, since it uses less digits than its factorization.

19990347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512589.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 19990347 is about 4471.0565865352. The cubic root of 19990347 is about 271.3980841763.

The spelling of 19990347 in words is "nineteen million, nine hundred ninety thousand, three hundred forty-seven".