18790849 has 16 divisors (see below), whose sum is σ = 23538816. Its totient is φ = 14572800.

The previous prime is 18790847. The next prime is 18790853. The reversal of 18790849 is 94809781.

18790849 = 1302² + 1303² + ... + 1312².

It is a happy number.

It is not a de Polignac number, because 18790849 - 2¹ = 18790847 is a prime.

It is a super-2 number, since 2×18790849² = 706192012281602, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18790799 and 18790808.

It is not an unprimeable number, because it can be changed into a prime (18790841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20889 + ... + 21769.

It is an arithmetic number, because the mean of its divisors is an integer number (1471176).

Almost surely, 2^18790849 is an apocalyptic number.

It is an amenable number.

18790849 is a deficient number, since it is larger than the sum of its proper divisors (4747967).

18790849 is a wasteful number, since it uses less digits than its factorization.

18790849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 18790849 is about 4334.8412889055. The cubic root of 18790849 is about 265.8574292046.

The spelling of 18790849 in words is "eighteen million, seven hundred ninety thousand, eight hundred forty-nine".