19770149 has 4 divisors (see below), whose sum is σ = 22594464. Its totient is φ = 16945836.

The previous prime is 19770139. The next prime is 19770169. The reversal of 19770149 is 94107791.

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: 94107791 = 293 ⋅321187.

It is a cyclic number.

It is not a de Polignac number, because 19770149 - 2¹⁶ = 19704613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19770139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1412147 + ... + 1412160.

It is an arithmetic number, because the mean of its divisors is an integer number (5648616).

Almost surely, 2^19770149 is an apocalyptic number.

It is an amenable number.

19770149 is a deficient number, since it is larger than the sum of its proper divisors (2824315).

19770149 is an equidigital number, since it uses as much as digits as its factorization.

19770149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824314.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 19770149 is about 4446.3635703797. The cubic root of 19770149 is about 270.3978998369.

The spelling of 19770149 in words is "nineteen million, seven hundred seventy thousand, one hundred forty-nine".