1661420 has 12 divisors (see below), whose sum is σ = 3489024. Its totient is φ = 664560.

The previous prime is 1661353. The next prime is 1661431. The reversal of 1661420 is 241661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 83071 = 1661420 / (1 + 6 + 6 + 1 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1661392 and 1661401.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41516 + ... + 41555.

It is an arithmetic number, because the mean of its divisors is an integer number (290752).

2^1661420 is an apocalyptic number.

1661420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1661420 is an abundant number, since it is smaller than the sum of its proper divisors (1827604).

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

1661420 is a wasteful number, since it uses less digits than its factorization.

1661420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83080 (or 83078 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1661420 is about 1288.9608217475. The cubic root of 1661420 is about 118.4385671474.

The spelling of 1661420 in words is "one million, six hundred sixty-one thousand, four hundred twenty".