1720240149 has 32 divisors (see below), whose sum is σ = 2522482560. Its totient is φ = 1038292992.

The previous prime is 1720240147. The next prime is 1720240187. The reversal of 1720240149 is 9410420271.

It is not a de Polignac number, because 1720240149 - 2¹ = 1720240147 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720240141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162822 + ... + 173064.

It is an arithmetic number, because the mean of its divisors is an integer number (78827580).

Almost surely, 2^1720240149 is an apocalyptic number.

It is an amenable number.

1720240149 is a deficient number, since it is larger than the sum of its proper divisors (802242411).

1720240149 is a wasteful number, since it uses less digits than its factorization.

1720240149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10389.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1720240149 is about 41475.7778588901. Note that the first 3 decimals coincide. The cubic root of 1720240149 is about 1198.2010426692.

The spelling of 1720240149 in words is "one billion, seven hundred twenty million, two hundred forty thousand, one hundred forty-nine".