1641406 has 8 divisors (see below), whose sum is σ = 2651544. Its totient is φ = 757560.

The previous prime is 1641403. The next prime is 1641407. The reversal of 1641406 is 6041461.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 31540 + ... + 31591.

It is an arithmetic number, because the mean of its divisors is an integer number (331443).

2^1641406 is an apocalyptic number.

1641406 is a deficient number, since it is larger than the sum of its proper divisors (1010138).

1641406 is a wasteful number, since it uses less digits than its factorization.

1641406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63146.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1641406 is about 1281.1736806538. The cubic root of 1641406 is about 117.9610615561.

Adding to 1641406 its reverse (6041461), we get a palindrome (7682867).

The spelling of 1641406 in words is "one million, six hundred forty-one thousand, four hundred six".