1923641 has 4 divisors (see below), whose sum is σ = 1927284. Its totient is φ = 1920000.

The previous prime is 1923613. The next prime is 1923653. The reversal of 1923641 is 1463291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1463291 = 449 ⋅3259.

It can be written as a sum of positive squares in 2 ways, for example, as 1428025 + 495616 = 1195^2 + 704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1923641 is a prime.

It is an Ulam number.

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 1923641.

It is not an unprimeable number, because it can be changed into a prime (1923611) 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, 860 + ... + 2141.

It is an arithmetic number, because the mean of its divisors is an integer number (481821).

2^1923641 is an apocalyptic number.

It is an amenable number.

1923641 is a deficient number, since it is larger than the sum of its proper divisors (3643).

1923641 is an equidigital number, since it uses as much as digits as its factorization.

1923641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3642.

The product of its digits is 1296, while the sum is 26.

The square root of 1923641 is about 1386.9538564783. The cubic root of 1923641 is about 124.3678161385.

The spelling of 1923641 in words is "one million, nine hundred twenty-three thousand, six hundred forty-one".