1621204 has 12 divisors (see below), whose sum is σ = 3055444. Its totient is φ = 748224.

The previous prime is 1621177. The next prime is 1621219. The reversal of 1621204 is 4021261.

1621204 = T₁₂₂ + T₁₂₃ + ... + T₂₂₅.

It can be written as a sum of positive squares in 2 ways, for example, as 722500 + 898704 = 850^2 + 948^2 .

It is a zygodrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15537 + ... + 15640.

2^1621204 is an apocalyptic number.

It is an amenable number.

1621204 is a deficient number, since it is larger than the sum of its proper divisors (1434240).

1621204 is a wasteful number, since it uses less digits than its factorization.

1621204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31194 (or 31192 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1621204 is about 1273.2650941575. The cubic root of 1621204 is about 117.4751177129.

Adding to 1621204 its reverse (4021261), we get a palindrome (5642465).

The spelling of 1621204 in words is "one million, six hundred twenty-one thousand, two hundred four".