18970778 has 16 divisors (see below), whose sum is σ = 30132000. Its totient is φ = 8932752.

The previous prime is 18970771. The next prime is 18970789. The reversal of 18970778 is 87707981.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18970771) 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, 5408 + ... + 8196.

It is an arithmetic number, because the mean of its divisors is an integer number (1883250).

Almost surely, 2^18970778 is an apocalyptic number.

18970778 is a deficient number, since it is larger than the sum of its proper divisors (11161222).

18970778 is a wasteful number, since it uses less digits than its factorization.

18970778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2989.

The product of its (nonzero) digits is 197568, while the sum is 47.

The square root of 18970778 is about 4355.5456604196. The cubic root of 18970778 is about 266.7032946215.

The spelling of 18970778 in words is "eighteen million, nine hundred seventy thousand, seven hundred seventy-eight".