18899380 has 12 divisors (see below), whose sum is σ = 39688740. Its totient is φ = 7559744.

The previous prime is 18899371. The next prime is 18899381. The reversal of 18899380 is 8399881.

18899380 = T₂₇₄₇ + T₂₇₄₈ + ... + T₂₇₅₁.

It can be written as a sum of positive squares in 2 ways, for example, as 7257636 + 11641744 = 2694^2 + 3412^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18899380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18899381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472465 + ... + 472504.

It is an arithmetic number, because the mean of its divisors is an integer number (3307395).

Almost surely, 2^18899380 is an apocalyptic number.

18899380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18899380 is an abundant number, since it is smaller than the sum of its proper divisors (20789360).

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

18899380 is a wasteful number, since it uses less digits than its factorization.

18899380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944978 (or 944976 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 18899380 is about 4347.3417164976. The cubic root of 18899380 is about 266.3682877900.

The spelling of 18899380 in words is "eighteen million, eight hundred ninety-nine thousand, three hundred eighty".