18277940 has 24 divisors (see below), whose sum is σ = 38634792. Its totient is φ = 7263360.

The previous prime is 18277937. The next prime is 18277949. The reversal of 18277940 is 4977281.

18277940 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in 4 ways, for example, as 3083536 + 15194404 = 1756^2 + 3898^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18277894 and 18277903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18277949) 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, 230 + ... + 6050.

It is an arithmetic number, because the mean of its divisors is an integer number (1609783).

Almost surely, 2^18277940 is an apocalyptic number.

18277940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18277940 is an abundant number, since it is smaller than the sum of its proper divisors (20356852).

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

18277940 is a wasteful number, since it uses less digits than its factorization.

18277940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5987 (or 5985 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 18277940 is about 4275.2707516601. The cubic root of 18277940 is about 263.4161608098.

The spelling of 18277940 in words is "eighteen million, two hundred seventy-seven thousand, nine hundred forty".