1866720 has 48 divisors (see below), whose sum is σ = 5881680. Its totient is φ = 497664.

The previous prime is 1866679. The next prime is 1866721. The reversal of 1866720 is 276681.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866721) 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, 1465 + ... + 2424.

It is an arithmetic number, because the mean of its divisors is an integer number (122535).

2^1866720 is an apocalyptic number.

1866720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1866720 is an abundant number, since it is smaller than the sum of its proper divisors (4014960).

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

1866720 is a wasteful number, since it uses less digits than its factorization.

1866720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3907 (or 3899 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1866720 is about 1366.2796199900. The cubic root of 1866720 is about 123.1288226630.

The spelling of 1866720 in words is "one million, eight hundred sixty-six thousand, seven hundred twenty".