19440961 has 4 divisors (see below), whose sum is σ = 19526832. Its totient is φ = 19355092.

The previous prime is 19440959. The next prime is 19440973. The reversal of 19440961 is 16904491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16904491 = 2281 ⋅7411.

It is a cyclic number.

It is not a de Polignac number, because 19440961 - 2¹ = 19440959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19440901) 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, 42595 + ... + 43048.

It is an arithmetic number, because the mean of its divisors is an integer number (4881708).

Almost surely, 2^19440961 is an apocalyptic number.

It is an amenable number.

19440961 is a deficient number, since it is larger than the sum of its proper divisors (85871).

19440961 is an equidigital number, since it uses as much as digits as its factorization.

19440961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85870.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 19440961 is about 4409.1905152760. The cubic root of 19440961 is about 268.8887154097. Note that the first 3 decimals are identical.

The spelling of 19440961 in words is "nineteen million, four hundred forty thousand, nine hundred sixty-one".