19929401 has 2 divisors, whose sum is σ = 19929402. Its totient is φ = 19929400.

The previous prime is 19929397. The next prime is 19929407. The reversal of 19929401 is 10492991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15523600 + 4405801 = 3940^2 + 2099^2 .

It is a cyclic number.

It is not a de Polignac number, because 19929401 - 2² = 19929397 is a prime.

It is not a weakly prime, because it can be changed into another prime (19929407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9964700 + 9964701.

It is an arithmetic number, because the mean of its divisors is an integer number (9964701).

Almost surely, 2^19929401 is an apocalyptic number.

It is an amenable number.

19929401 is a deficient number, since it is larger than the sum of its proper divisors (1).

19929401 is an equidigital number, since it uses as much as digits as its factorization.

19929401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 19929401 is about 4464.2357688635. The cubic root of 19929401 is about 271.1219931594.

The spelling of 19929401 in words is "nineteen million, nine hundred twenty-nine thousand, four hundred one".