1945845 has 24 divisors (see below), whose sum is σ = 3680352. Its totient is φ = 943200.

The previous prime is 1945843. The next prime is 1945859. The reversal of 1945845 is 5485491.

It is not a de Polignac number, because 1945845 - 2¹ = 1945843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1945843) 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 23 ways as a sum of consecutive naturals, for example, 1471 + ... + 2460.

It is an arithmetic number, because the mean of its divisors is an integer number (153348).

2^1945845 is an apocalyptic number.

1945845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1945845 is a deficient number, since it is larger than the sum of its proper divisors (1734507).

1945845 is a wasteful number, since it uses less digits than its factorization.

1945845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3953 (or 3950 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 1945845 is about 1394.9354823790. The cubic root of 1945845 is about 124.8444999715.

It can be divided in two parts, 19458 and 45, that added together give a triangular number (19503 = T₁₉₇).

The spelling of 1945845 in words is "one million, nine hundred forty-five thousand, eight hundred forty-five".