1623655 has 16 divisors (see below), whose sum is σ = 2169504. Its totient is φ = 1156480.

The previous prime is 1623647. The next prime is 1623667. The reversal of 1623655 is 5563261.

It is not a de Polignac number, because 1623655 - 2³ = 1623647 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2637 + ... + 3193.

It is an arithmetic number, because the mean of its divisors is an integer number (135594).

2^1623655 is an apocalyptic number.

1623655 is a deficient number, since it is larger than the sum of its proper divisors (545849).

1623655 is a wasteful number, since it uses less digits than its factorization.

1623655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626.

The product of its digits is 5400, while the sum is 28.

The square root of 1623655 is about 1274.2272167867. The cubic root of 1623655 is about 117.5342890722.

It can be divided in two parts, 1623 and 655, that added together give a triangular number (2278 = T₆₇).

The spelling of 1623655 in words is "one million, six hundred twenty-three thousand, six hundred fifty-five".