18791934 has 16 divisors (see below), whose sum is σ = 42953088. Its totient is φ = 5369112.

The previous prime is 18791933. The next prime is 18791939. The reversal of 18791934 is 43919781.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 447427 = 18791934 / (1 + 8 + 7 + 9 + 1 + 9 + 3 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18791933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223672 + ... + 223755.

It is an arithmetic number, because the mean of its divisors is an integer number (2684568).

Almost surely, 2^18791934 is an apocalyptic number.

18791934 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18791934 is an abundant number, since it is smaller than the sum of its proper divisors (24161154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18791934 is a wasteful number, since it uses less digits than its factorization.

18791934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447439.

The product of its digits is 54432, while the sum is 42.

The square root of 18791934 is about 4334.9664358562. The cubic root of 18791934 is about 265.8625460527.

The spelling of 18791934 in words is "eighteen million, seven hundred ninety-one thousand, nine hundred thirty-four".