1945945 has 4 divisors (see below), whose sum is σ = 2335140. Its totient is φ = 1556752.

The previous prime is 1945943. The next prime is 1945969. The reversal of 1945945 is 5495491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5495491 = 1613 ⋅3407.

It can be written as a sum of positive squares in 2 ways, for example, as 824464 + 1121481 = 908^2 + 1059^2 .

It is a cyclic number.

It is not a de Polignac number, because 1945945 - 2¹ = 1945943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1945943) 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, 194590 + ... + 194599.

It is an arithmetic number, because the mean of its divisors is an integer number (583785).

2^1945945 is an apocalyptic number.

It is an amenable number.

1945945 is a deficient number, since it is larger than the sum of its proper divisors (389195).

1945945 is an equidigital number, since it uses as much as digits as its factorization.

1945945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389194.

The product of its digits is 32400, while the sum is 37.

The square root of 1945945 is about 1394.9713258702. The cubic root of 1945945 is about 124.8466385858.

The spelling of 1945945 in words is "one million, nine hundred forty-five thousand, nine hundred forty-five".