18910648 has 8 divisors (see below), whose sum is σ = 35457480. Its totient is φ = 9455320.

The previous prime is 18910609. The next prime is 18910649. The reversal of 18910648 is 84601981.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×18910648² = 715225215559808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18910649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1181908 + ... + 1181923.

It is an arithmetic number, because the mean of its divisors is an integer number (4432185).

Almost surely, 2^18910648 is an apocalyptic number.

It is an amenable number.

18910648 is a deficient number, since it is larger than the sum of its proper divisors (16546832).

18910648 is a wasteful number, since it uses less digits than its factorization.

18910648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363837 (or 2363833 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18910648 is about 4348.6374877656. The cubic root of 18910648 is about 266.4212144216.

The spelling of 18910648 in words is "eighteen million, nine hundred ten thousand, six hundred forty-eight".