18629649 has 8 divisors (see below), whose sum is σ = 27599520. Its totient is φ = 12419748.

The previous prime is 18629627. The next prime is 18629657. The reversal of 18629649 is 94692681.

It is a happy number.

18629649 is a `hidden beast` number, since 18 + 629 + 6 + 4 + 9 = 666.

It is not a de Polignac number, because 18629649 - 2⁵ = 18629617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18629669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344967 + ... + 345020.

It is an arithmetic number, because the mean of its divisors is an integer number (3449940).

Almost surely, 2^18629649 is an apocalyptic number.

It is an amenable number.

18629649 is a deficient number, since it is larger than the sum of its proper divisors (8969871).

18629649 is an equidigital number, since it uses as much as digits as its factorization.

18629649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689996 (or 689990 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 18629649 is about 4316.2077104792. The cubic root of 18629649 is about 265.0950128033.

It can be divided in two parts, 1862 and 9649, that added together give a palindrome (11511).

The spelling of 18629649 in words is "eighteen million, six hundred twenty-nine thousand, six hundred forty-nine".