18938195207 has 4 divisors (see below), whose sum is σ = 18953003520. Its totient is φ = 18923386896.

The previous prime is 18938195201. The next prime is 18938195231. The reversal of 18938195207 is 70259183981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70259183981 = 7 ⋅10037026283.

It is a cyclic number.

It is not a de Polignac number, because 18938195207 - 2⁴ = 18938195191 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 (18938195201) 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, 7402238 + ... + 7404795.

It is an arithmetic number, because the mean of its divisors is an integer number (4738250880).

Almost surely, 2^18938195207 is an apocalyptic number.

18938195207 is a deficient number, since it is larger than the sum of its proper divisors (14808313).

18938195207 is a wasteful number, since it uses less digits than its factorization.

18938195207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14808312.

The product of its (nonzero) digits is 1088640, while the sum is 53.

The spelling of 18938195207 in words is "eighteen billion, nine hundred thirty-eight million, one hundred ninety-five thousand, two hundred seven".