18950013 has 6 divisors (see below), whose sum is σ = 27372254. Its totient is φ = 12633336.

The previous prime is 18950003. The next prime is 18950023. The reversal of 18950013 is 31005981.

It is an interprime number because it is at equal distance from previous prime (18950003) and next prime (18950023).

It can be written as a sum of positive squares in only one way, i.e., 18818244 + 131769 = 4338^2 + 363^2 .

It is not a de Polignac number, because 18950013 - 2⁶ = 18949949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18950003) 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 5 ways as a sum of consecutive naturals, for example, 1052770 + ... + 1052787.

Almost surely, 2^18950013 is an apocalyptic number.

It is an amenable number.

18950013 is a deficient number, since it is larger than the sum of its proper divisors (8422241).

18950013 is a wasteful number, since it uses less digits than its factorization.

18950013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105563 (or 2105560 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 18950013 is about 4353.1612651038. The cubic root of 18950013 is about 266.6059498919.

Adding to 18950013 its reverse (31005981), we get a palindrome (49955994).

The spelling of 18950013 in words is "eighteen million, nine hundred fifty thousand, thirteen".