1621427 has 8 divisors (see below), whose sum is σ = 1687392. Its totient is φ = 1556800.

The previous prime is 1621423. The next prime is 1621439. The reversal of 1621427 is 7241261.

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

It is a cyclic number.

It is not a de Polignac number, because 1621427 - 2² = 1621423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1621421) 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 7 ways as a sum of consecutive naturals, for example, 2633 + ... + 3189.

It is an arithmetic number, because the mean of its divisors is an integer number (210924).

2^1621427 is an apocalyptic number.

1621427 is a deficient number, since it is larger than the sum of its proper divisors (65965).

1621427 is an equidigital number, since it uses as much as digits as its factorization.

1621427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669.

The product of its digits is 672, while the sum is 23.

The square root of 1621427 is about 1273.3526612844. The cubic root of 1621427 is about 117.4805037820.

Adding to 1621427 its reverse (7241261), we get a palindrome (8862688).

It can be divided in two parts, 1621 and 427, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 1621427 in words is "one million, six hundred twenty-one thousand, four hundred twenty-seven".