19749963 has 4 divisors (see below), whose sum is σ = 26333288. Its totient is φ = 13166640.

The previous prime is 19749929. The next prime is 19749979. The reversal of 19749963 is 36994791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36994791 = 3 ⋅12331597.

It is not a de Polignac number, because 19749963 - 2⁸ = 19749707 is a prime.

It is a super-2 number, since 2×19749963² = 780122077002738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19749913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3291658 + ... + 3291663.

It is an arithmetic number, because the mean of its divisors is an integer number (6583322).

Almost surely, 2^19749963 is an apocalyptic number.

19749963 is a deficient number, since it is larger than the sum of its proper divisors (6583325).

19749963 is an equidigital number, since it uses as much as digits as its factorization.

19749963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6583324.

The product of its digits is 367416, while the sum is 48.

The square root of 19749963 is about 4444.0930458306. The cubic root of 19749963 is about 270.3058399887.

The spelling of 19749963 in words is "nineteen million, seven hundred forty-nine thousand, nine hundred sixty-three".