1621012 has 6 divisors (see below), whose sum is σ = 2836778. Its totient is φ = 810504.

The previous prime is 1620989. The next prime is 1621019. The reversal of 1621012 is 2101261.

It can be written as a sum of positive squares in only one way, i.e., 1449616 + 171396 = 1204^2 + 414^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1620983 and 1621001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202623 + ... + 202630.

2^1621012 is an apocalyptic number.

It is an amenable number.

1621012 is a deficient number, since it is larger than the sum of its proper divisors (1215766).

1621012 is a wasteful number, since it uses less digits than its factorization.

1621012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405257 (or 405255 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1621012 is about 1273.1896952143. The cubic root of 1621012 is about 117.4704799842.

Adding to 1621012 its reverse (2101261), we get a palindrome (3722273).

Subtracting 1621012 from its reverse (2101261), we obtain a square (480249 = 693²).

The spelling of 1621012 in words is "one million, six hundred twenty-one thousand, twelve".