1621366 has 8 divisors (see below), whose sum is σ = 2437560. Its totient is φ = 808848.

The previous prime is 1621363. The next prime is 1621369. The reversal of 1621366 is 6631261.

It is an interprime number because it is at equal distance from previous prime (1621363) and next prime (1621369).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1621366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 930 + ... + 2026.

It is an arithmetic number, because the mean of its divisors is an integer number (304695).

2^1621366 is an apocalyptic number.

1621366 is a deficient number, since it is larger than the sum of its proper divisors (816194).

1621366 is a wasteful number, since it uses less digits than its factorization.

1621366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1838.

The product of its digits is 1296, while the sum is 25.

The square root of 1621366 is about 1273.3287085431. The cubic root of 1621366 is about 117.4790305117.

The spelling of 1621366 in words is "one million, six hundred twenty-one thousand, three hundred sixty-six".