19001041978 has 32 divisors (see below), whose sum is σ = 30074084352. Its totient is φ = 8991091200.

The previous prime is 19001041973. The next prime is 19001041987. The reversal of 19001041978 is 87914010091.

It is a super-2 number, since 2×19001041978² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19001041978.

It is not an unprimeable number, because it can be changed into a prime (19001041973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1012650 + ... + 1031242.

It is an arithmetic number, because the mean of its divisors is an integer number (939815136).

Almost surely, 2^19001041978 is an apocalyptic number.

19001041978 is a deficient number, since it is larger than the sum of its proper divisors (11073042374).

19001041978 is a wasteful number, since it uses less digits than its factorization.

19001041978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18990.

The product of its (nonzero) digits is 18144, while the sum is 40.

The spelling of 19001041978 in words is "nineteen billion, one million, forty-one thousand, nine hundred seventy-eight".