18679990 has 32 divisors (see below), whose sum is σ = 39087360. Its totient is φ = 6294624.

The previous prime is 18679987. The next prime is 18679993. The reversal of 18679990 is 9997681.

18679990 = T₂₇₄ + T₂₇₅ + ... + T₅₀₉.

It is an interprime number because it is at equal distance from previous prime (18679987) and next prime (18679993).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18679993) 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 15 ways as a sum of consecutive naturals, for example, 1869 + ... + 6391.

It is an arithmetic number, because the mean of its divisors is an integer number (1221480).

Almost surely, 2^18679990 is an apocalyptic number.

18679990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18679990 is an abundant number, since it is smaller than the sum of its proper divisors (20407370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18679990 is a wasteful number, since it uses less digits than its factorization.

18679990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4596.

The product of its (nonzero) digits is 244944, while the sum is 49.

The square root of 18679990 is about 4322.0354001327. The cubic root of 18679990 is about 265.3335777854. Note that the first 3 decimals are identical.

The spelling of 18679990 in words is "eighteen million, six hundred seventy-nine thousand, nine hundred ninety".