1622647 has 4 divisors (see below), whose sum is σ = 1747480. Its totient is φ = 1497816.

The previous prime is 1622641. The next prime is 1622659. The reversal of 1622647 is 7462261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1622647 - 2³ = 1622639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1622641) by changing a digit.

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, 62397 + ... + 62422.

It is an arithmetic number, because the mean of its divisors is an integer number (436870).

2^1622647 is an apocalyptic number.

1622647 is a deficient number, since it is larger than the sum of its proper divisors (124833).

1622647 is a wasteful number, since it uses less digits than its factorization.

1622647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124832.

The product of its digits is 4032, while the sum is 28.

The square root of 1622647 is about 1273.8316215262. The cubic root of 1622647 is about 117.5099614310.

It can be divided in two parts, 162 and 2647, that added together give a square (2809 = 53²).

The spelling of 1622647 in words is "one million, six hundred twenty-two thousand, six hundred forty-seven".