1866540 has 48 divisors (see below), whose sum is σ = 5630688. Its totient is φ = 459264.

The previous prime is 1866521. The next prime is 1866547. The reversal of 1866540 is 456681.

1866540 = T₁₅₇ + T₁₅₈ + ... + T₂₄₆.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1866498 and 1866507.

It is not an unprimeable number, because it can be changed into a prime (1866547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 417 + ... + 1976.

It is an arithmetic number, because the mean of its divisors is an integer number (117306).

2^1866540 is an apocalyptic number.

1866540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1866540 is an abundant number, since it is smaller than the sum of its proper divisors (3764148).

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

1866540 is a wasteful number, since it uses less digits than its factorization.

1866540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2418 (or 2416 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1866540 is about 1366.2137460881. The cubic root of 1866540 is about 123.1248649367.

The spelling of 1866540 in words is "one million, eight hundred sixty-six thousand, five hundred forty".