2019406749 has 4 divisors (see below), whose sum is σ = 2692542336. Its totient is φ = 1346271164.

The previous prime is 2019406723. The next prime is 2019406751. The reversal of 2019406749 is 9476049102.

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.

It is a cyclic number.

It is not a de Polignac number, because 2019406749 - 2⁵ = 2019406717 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2019406749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2019406709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336567789 + ... + 336567794.

It is an arithmetic number, because the mean of its divisors is an integer number (673135584).

Almost surely, 2^2019406749 is an apocalyptic number.

It is an amenable number.

2019406749 is a deficient number, since it is larger than the sum of its proper divisors (673135587).

2019406749 is an equidigital number, since it uses as much as digits as its factorization.

2019406749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673135586.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 2019406749 is about 44937.8097930907. The cubic root of 2019406749 is about 1263.9831014822.

The spelling of 2019406749 in words is "two billion, nineteen million, four hundred six thousand, seven hundred forty-nine".