1641420 has 72 divisors (see below), whose sum is σ = 5438160. Its totient is φ = 397440.

The previous prime is 1641407. The next prime is 1641457. The reversal of 1641420 is 241461.

1641420 is a `hidden beast` number, since 1 + 641 + 4 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1641393 and 1641402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1566 + ... + 2394.

It is an arithmetic number, because the mean of its divisors is an integer number (75530).

2^1641420 is an apocalyptic number.

1641420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1641420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2719080).

1641420 is an abundant number, since it is smaller than the sum of its proper divisors (3796740).

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

1641420 is a wasteful number, since it uses less digits than its factorization.

1641420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855 (or 850 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1641420 is about 1281.1791443822. The cubic root of 1641420 is about 117.9613969292.

Adding to 1641420 its reverse (241461), we get a palindrome (1882881).

The spelling of 1641420 in words is "one million, six hundred forty-one thousand, four hundred twenty".