18311950 has 12 divisors (see below), whose sum is σ = 34060320. Its totient is φ = 7324760.

The previous prime is 18311947. The next prime is 18311957. The reversal of 18311950 is 5911381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18311957) 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, 183070 + ... + 183169.

It is an arithmetic number, because the mean of its divisors is an integer number (2838360).

Almost surely, 2^18311950 is an apocalyptic number.

18311950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18311950 is a deficient number, since it is larger than the sum of its proper divisors (15748370).

18311950 is a wasteful number, since it uses less digits than its factorization.

18311950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366251 (or 366246 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 18311950 is about 4279.2464289872. The cubic root of 18311950 is about 263.5794402018.

The spelling of 18311950 in words is "eighteen million, three hundred eleven thousand, nine hundred fifty".