19441945 has 4 divisors (see below), whose sum is σ = 23330340. Its totient is φ = 15553552.

The previous prime is 19441907. The next prime is 19441951. The reversal of 19441945 is 54914491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54914491 = 457 ⋅120163.

It can be written as a sum of positive squares in 2 ways, for example, as 2368521 + 17073424 = 1539^2 + 4132^2 .

It is a cyclic number.

It is not a de Polignac number, because 19441945 - 2¹³ = 19433753 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1944190 + ... + 1944199.

It is an arithmetic number, because the mean of its divisors is an integer number (5832585).

Almost surely, 2^19441945 is an apocalyptic number.

It is an amenable number.

19441945 is a deficient number, since it is larger than the sum of its proper divisors (3888395).

19441945 is an equidigital number, since it uses as much as digits as its factorization.

19441945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888394.

The product of its digits is 25920, while the sum is 37.

The square root of 19441945 is about 4409.3020989721. The cubic root of 19441945 is about 268.8932519144.

The spelling of 19441945 in words is "nineteen million, four hundred forty-one thousand, nine hundred forty-five".