18759949 has 4 divisors (see below), whose sum is σ = 20203036. Its totient is φ = 17316864.

The previous prime is 18759941. The next prime is 18759953. The reversal of 18759949 is 94995781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5929225 + 12830724 = 2435^2 + 3582^2 .

It is a cyclic number.

It is not a de Polignac number, because 18759949 - 2³ = 18759941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18759896 and 18759905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18759941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721524 + ... + 721549.

It is an arithmetic number, because the mean of its divisors is an integer number (5050759).

Almost surely, 2^18759949 is an apocalyptic number.

It is an amenable number.

18759949 is a deficient number, since it is larger than the sum of its proper divisors (1443087).

18759949 is a wasteful number, since it uses less digits than its factorization.

18759949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443086.

The product of its digits is 816480, while the sum is 52.

The square root of 18759949 is about 4331.2756781346. The cubic root of 18759949 is about 265.7116223877.

The spelling of 18759949 in words is "eighteen million, seven hundred fifty-nine thousand, nine hundred forty-nine".