19744213978 has 8 divisors (see below), whose sum is σ = 30903987168. Its totient is φ = 9442884924.

The previous prime is 19744213969. The next prime is 19744213997. The reversal of 19744213978 is 87931244791.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214610976 + ... + 214611067.

It is an arithmetic number, because the mean of its divisors is an integer number (3862998396).

Almost surely, 2^19744213978 is an apocalyptic number.

19744213978 is a deficient number, since it is larger than the sum of its proper divisors (11159773190).

19744213978 is a wasteful number, since it uses less digits than its factorization.

19744213978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429222068.

The product of its digits is 3048192, while the sum is 55.

The spelling of 19744213978 in words is "nineteen billion, seven hundred forty-four million, two hundred thirteen thousand, nine hundred seventy-eight".