18961963 has 4 divisors (see below), whose sum is σ = 19098520. Its totient is φ = 18825408.

The previous prime is 18961961. The next prime is 18961993. The reversal of 18961963 is 36916981.

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

It is a cyclic number.

It is not a de Polignac number, because 18961963 - 2¹ = 18961961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18961961) 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 3 ways as a sum of consecutive naturals, for example, 68070 + ... + 68347.

It is an arithmetic number, because the mean of its divisors is an integer number (4774630).

Almost surely, 2^18961963 is an apocalyptic number.

18961963 is a deficient number, since it is larger than the sum of its proper divisors (136557).

18961963 is a wasteful number, since it uses less digits than its factorization.

18961963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136556.

The product of its digits is 69984, while the sum is 43.

The square root of 18961963 is about 4354.5336145218. The cubic root of 18961963 is about 266.6619792579.

The spelling of 18961963 in words is "eighteen million, nine hundred sixty-one thousand, nine hundred sixty-three".