19790247 has 4 divisors (see below), whose sum is σ = 26387000. Its totient is φ = 13193496.

The previous prime is 19790233. The next prime is 19790257. The reversal of 19790247 is 74209791.

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

It is not a de Polignac number, because 19790247 - 2⁷ = 19790119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19790207) 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, 3298372 + ... + 3298377.

It is an arithmetic number, because the mean of its divisors is an integer number (6596750).

Almost surely, 2^19790247 is an apocalyptic number.

19790247 is a deficient number, since it is larger than the sum of its proper divisors (6596753).

19790247 is an equidigital number, since it uses as much as digits as its factorization.

19790247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6596752.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 19790247 is about 4448.6230453928. The cubic root of 19790247 is about 270.4894961202.

The spelling of 19790247 in words is "nineteen million, seven hundred ninety thousand, two hundred forty-seven".