18774940 has 12 divisors (see below), whose sum is σ = 39427416. Its totient is φ = 7509968.

The previous prime is 18774901. The next prime is 18774979. The reversal of 18774940 is 4947781.

It is an interprime number because it is at equal distance from previous prime (18774901) and next prime (18774979).

It is a junction number, because it is equal to n+sod(n) for n = 18774893 and 18774902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469354 + ... + 469393.

It is an arithmetic number, because the mean of its divisors is an integer number (3285618).

Almost surely, 2^18774940 is an apocalyptic number.

18774940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18774940 is an abundant number, since it is smaller than the sum of its proper divisors (20652476).

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

18774940 is a wasteful number, since it uses less digits than its factorization.

18774940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938756 (or 938754 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 18774940 is about 4333.0058850641. The cubic root of 18774940 is about 265.7823799076.

The spelling of 18774940 in words is "eighteen million, seven hundred seventy-four thousand, nine hundred forty".