18941870 has 16 divisors (see below), whose sum is σ = 34480080. Its totient is φ = 7491264.

The previous prime is 18941861. The next prime is 18941873. The reversal of 18941870 is 7814981.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18941873) 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, 9752 + ... + 11531.

It is an arithmetic number, because the mean of its divisors is an integer number (2155005).

Almost surely, 2^18941870 is an apocalyptic number.

18941870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18941870 is a deficient number, since it is larger than the sum of its proper divisors (15538210).

18941870 is a wasteful number, since it uses less digits than its factorization.

18941870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21379.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18941870 is about 4352.2258673005. The cubic root of 18941870 is about 266.5677567204.

The spelling of 18941870 in words is "eighteen million, nine hundred forty-one thousand, eight hundred seventy".