19404961 has 2 divisors, whose sum is σ = 19404962. Its totient is φ = 19404960.

The previous prime is 19404953. The next prime is 19405003. The reversal of 19404961 is 16940491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13249600 + 6155361 = 3640^2 + 2481^2 .

It is a cyclic number.

It is not a de Polignac number, because 19404961 - 2³ = 19404953 is a prime.

It is a super-2 number, since 2×19404961² = 753105022823042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19404901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9702480 + 9702481.

It is an arithmetic number, because the mean of its divisors is an integer number (9702481).

Almost surely, 2^19404961 is an apocalyptic number.

It is an amenable number.

19404961 is a deficient number, since it is larger than the sum of its proper divisors (1).

19404961 is an equidigital number, since it uses as much as digits as its factorization.

19404961 is an evil number, because the sum of its binary digits is even.

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

The square root of 19404961 is about 4405.1062416246. The cubic root of 19404961 is about 268.7226403733.

The spelling of 19404961 in words is "nineteen million, four hundred four thousand, nine hundred sixty-one".