1660420 has 24 divisors (see below), whose sum is σ = 3546648. Its totient is φ = 652800.

The previous prime is 1660411. The next prime is 1660423. The reversal of 1660420 is 240661.

It can be written as a sum of positive squares in 4 ways, for example, as 42436 + 1617984 = 206^2 + 1272^2 .

It is a super-3 number, since 3×1660420³ = 13733306803638264000, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1660423) 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, 540 + ... + 1900.

It is an arithmetic number, because the mean of its divisors is an integer number (147777).

2^1660420 is an apocalyptic number.

1660420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660420 is an abundant number, since it is smaller than the sum of its proper divisors (1886228).

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

1660420 is a wasteful number, since it uses less digits than its factorization.

1660420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431 (or 1429 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1660420 is about 1288.5728539745. The cubic root of 1660420 is about 118.4147998605.

It can be divided in two parts, 1660 and 420, that added together give a triangular number (2080 = T₆₄).

The spelling of 1660420 in words is "one million, six hundred sixty thousand, four hundred twenty".