49618 has 4 divisors (see below), whose sum is σ = 74430. Its totient is φ = 24808.

The previous prime is 49613. The next prime is 49627. The reversal of 49618 is 81694.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81694 = 2 ⋅40847.

It can be written as a sum of positive squares in only one way, i.e., 33489 + 16129 = 183^2 + 127^2 .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (49613) by changing a digit.

49618 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 12403 + ... + 12406.

2⁴⁹⁶¹⁸ is an apocalyptic number.

49618 is a deficient number, since it is larger than the sum of its proper divisors (24812).

49618 is a wasteful number, since it uses less digits than its factorization.

49618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24811.

The product of its digits is 1728, while the sum is 28.

The square root of 49618 is about 222.7509820405. The cubic root of 49618 is about 36.7462550367.

The spelling of 49618 in words is "forty-nine thousand, six hundred eighteen".