19890466 has 4 divisors (see below), whose sum is σ = 29835702. Its totient is φ = 9945232.

The previous prime is 19890463. The next prime is 19890503. The reversal of 19890466 is 66409891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66409891 = 139 ⋅477769.

It can be written as a sum of positive squares in only one way, i.e., 17098225 + 2792241 = 4135^2 + 1671^2 .

It is not an unprimeable number, because it can be changed into a prime (19890461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972615 + ... + 4972618.

Almost surely, 2^19890466 is an apocalyptic number.

19890466 is a deficient number, since it is larger than the sum of its proper divisors (9945236).

19890466 is an equidigital number, since it uses as much as digits as its factorization.

19890466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9945235.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 19890466 is about 4459.8728681432. The cubic root of 19890466 is about 270.9453192327.

The spelling of 19890466 in words is "nineteen million, eight hundred ninety thousand, four hundred sixty-six".