19928149 has 2 divisors, whose sum is σ = 19928150. Its totient is φ = 19928148.

The previous prime is 19928123. The next prime is 19928171. The reversal of 19928149 is 94182991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13089924 + 6838225 = 3618^2 + 2615^2 .

It is a cyclic number.

It is not a de Polignac number, because 19928149 - 2¹³ = 19919957 is a prime.

It is a super-2 number, since 2×19928149² = 794262245132402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19928119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9964074 + 9964075.

It is an arithmetic number, because the mean of its divisors is an integer number (9964075).

Almost surely, 2^19928149 is an apocalyptic number.

It is an amenable number.

19928149 is a deficient number, since it is larger than the sum of its proper divisors (1).

19928149 is an equidigital number, since it uses as much as digits as its factorization.

19928149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 43.

The square root of 19928149 is about 4464.0955410923. The cubic root of 19928149 is about 271.1163155871.

The spelling of 19928149 in words is "nineteen million, nine hundred twenty-eight thousand, one hundred forty-nine".