18880649 has 4 divisors (see below), whose sum is σ = 19200720. Its totient is φ = 18560580.

The previous prime is 18880639. The next prime is 18880669. The reversal of 18880649 is 94608881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18880649 - 2⁴ = 18880633 is a prime.

It is a super-2 number, since 2×18880649² = 712957813322402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18880639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159947 + ... + 160064.

It is an arithmetic number, because the mean of its divisors is an integer number (4800180).

Almost surely, 2^18880649 is an apocalyptic number.

It is an amenable number.

18880649 is a deficient number, since it is larger than the sum of its proper divisors (320071).

18880649 is an equidigital number, since it uses as much as digits as its factorization.

18880649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320070.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 18880649 is about 4345.1868774542. The cubic root of 18880649 is about 266.2802603237.

The spelling of 18880649 in words is "eighteen million, eight hundred eighty thousand, six hundred forty-nine".