18477540 has 36 divisors (see below), whose sum is σ = 56049084. Its totient is φ = 4927296.

The previous prime is 18477539. The next prime is 18477551. The reversal of 18477540 is 4577481.

It can be written as a sum of positive squares in 2 ways, for example, as 8892324 + 9585216 = 2982^2 + 3096^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18477495 and 18477504.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 51147 + ... + 51506.

It is an arithmetic number, because the mean of its divisors is an integer number (1556919).

Almost surely, 2^18477540 is an apocalyptic number.

18477540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18477540 is an abundant number, since it is smaller than the sum of its proper divisors (37571544).

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

18477540 is a wasteful number, since it uses less digits than its factorization.

18477540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102668 (or 102663 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 18477540 is about 4298.5509186236. The cubic root of 18477540 is about 264.3715498435.

The spelling of 18477540 in words is "eighteen million, four hundred seventy-seven thousand, five hundred forty".