1641405 has 16 divisors (see below), whose sum is σ = 2664000. Its totient is φ = 862848.

The previous prime is 1641403. The next prime is 1641407. The reversal of 1641405 is 5041461.

It is an interprime number because it is at equal distance from previous prime (1641403) and next prime (1641407).

It is not a de Polignac number, because 1641405 - 2¹ = 1641403 is a prime.

1641405 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641403) 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, 346 + ... + 1844.

It is an arithmetic number, because the mean of its divisors is an integer number (166500).

2^1641405 is an apocalyptic number.

1641405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1641405 is a deficient number, since it is larger than the sum of its proper divisors (1022595).

1641405 is a wasteful number, since it uses less digits than its factorization.

1641405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1641405 is about 1281.1732903866. The cubic root of 1641405 is about 117.9610376009.

Adding to 1641405 its reverse (5041461), we get a palindrome (6682866).

The spelling of 1641405 in words is "one million, six hundred forty-one thousand, four hundred five".