1621413 has 12 divisors (see below), whose sum is σ = 2354508. Its totient is φ = 1075200.

The previous prime is 1621397. The next prime is 1621421. The reversal of 1621413 is 3141261.

It is a happy number.

1621413 is a `hidden beast` number, since 1 + 621 + 41 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1520289 + 101124 = 1233^2 + 318^2 .

It is not a de Polignac number, because 1621413 - 2⁴ = 1621397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1963 + ... + 2663.

It is an arithmetic number, because the mean of its divisors is an integer number (196209).

2^1621413 is an apocalyptic number.

It is an amenable number.

1621413 is a deficient number, since it is larger than the sum of its proper divisors (733095).

1621413 is a wasteful number, since it uses less digits than its factorization.

1621413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964 (or 961 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1621413 is about 1273.3471639738. The cubic root of 1621413 is about 117.4801656577.

Adding to 1621413 its reverse (3141261), we get a palindrome (4762674).

The spelling of 1621413 in words is "one million, six hundred twenty-one thousand, four hundred thirteen".