1919893949 has 4 divisors (see below), whose sum is σ = 1934549760. Its totient is φ = 1905238140.

The previous prime is 1919893939. The next prime is 1919893979. The reversal of 1919893949 is 9493989191.

It is a happy number.

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 1919893949 - 2²⁸ = 1651458493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1919893891 and 1919893900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1919893919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7327709 + ... + 7327970.

It is an arithmetic number, because the mean of its divisors is an integer number (483637440).

Almost surely, 2^1919893949 is an apocalyptic number.

It is an amenable number.

1919893949 is a deficient number, since it is larger than the sum of its proper divisors (14655811).

1919893949 is a wasteful number, since it uses less digits than its factorization.

1919893949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14655810.

The product of its digits is 5668704, while the sum is 62.

The square root of 1919893949 is about 43816.5944477660. The cubic root of 1919893949 is about 1242.8701182717.

The spelling of 1919893949 in words is "one billion, nine hundred nineteen million, eight hundred ninety-three thousand, nine hundred forty-nine".