1945555 has 4 divisors (see below), whose sum is σ = 2334672. Its totient is φ = 1556440.

The previous prime is 1945553. The next prime is 1945561. The reversal of 1945555 is 5555491.

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

It is not a de Polignac number, because 1945555 - 2¹ = 1945553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1945555.

It is not an unprimeable number, because it can be changed into a prime (1945553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194551 + ... + 194560.

It is an arithmetic number, because the mean of its divisors is an integer number (583668).

2^1945555 is an apocalyptic number.

1945555 is a deficient number, since it is larger than the sum of its proper divisors (389117).

1945555 is an equidigital number, since it uses as much as digits as its factorization.

1945555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389116.

The product of its digits is 22500, while the sum is 34.

The square root of 1945555 is about 1394.8315310460. The cubic root of 1945555 is about 124.8382975755.

It can be divided in two parts, 1945 and 555, that added together give a square (2500 = 50²).

The spelling of 1945555 in words is "one million, nine hundred forty-five thousand, five hundred fifty-five".