1621206 has 12 divisors (see below), whose sum is σ = 3512652. Its totient is φ = 540396.

The previous prime is 1621177. The next prime is 1621219. The reversal of 1621206 is 6021261.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 90067 = 1621206 / (1 + 6 + 2 + 1 + 2 + 0 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45016 + ... + 45051.

It is an arithmetic number, because the mean of its divisors is an integer number (292721).

2^1621206 is an apocalyptic number.

1621206 is an abundant number, since it is smaller than the sum of its proper divisors (1891446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621206 is a wasteful number, since it uses less digits than its factorization.

1621206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90075 (or 90072 counting only the distinct ones).

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

The square root of 1621206 is about 1273.2658795397. The cubic root of 1621206 is about 117.4751660207.

Adding to 1621206 its reverse (6021261), we get a palindrome (7642467).

The spelling of 1621206 in words is "one million, six hundred twenty-one thousand, two hundred six".