19440431 has 2 divisors, whose sum is σ = 19440432. Its totient is φ = 19440430.

The previous prime is 19440427. The next prime is 19440457. The reversal of 19440431 is 13404491.

It is an a-pointer prime, because the next prime (19440457) can be obtained adding 19440431 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19440431 - 2² = 19440427 is a prime.

It is a super-2 number, since 2×19440431² = 755860714931522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19440431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19440461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9720215 + 9720216.

It is an arithmetic number, because the mean of its divisors is an integer number (9720216).

Almost surely, 2^19440431 is an apocalyptic number.

19440431 is a deficient number, since it is larger than the sum of its proper divisors (1).

19440431 is an equidigital number, since it uses as much as digits as its factorization.

19440431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 19440431 is about 4409.1304131314. The cubic root of 19440431 is about 268.8862719037.

The spelling of 19440431 in words is "nineteen million, four hundred forty thousand, four hundred thirty-one".