1919429378 has 4 divisors (see below), whose sum is σ = 2879144070. Its totient is φ = 959714688.

The previous prime is 1919429377. The next prime is 1919429417. The reversal of 1919429378 is 8739249191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8739249191 = 1481 ⋅5900911.

It can be written as a sum of positive squares in only one way, i.e., 1839809449 + 79619929 = 42893^2 + 8923^2 .

It is not an unprimeable number, because it can be changed into a prime (1919429377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 479857343 + ... + 479857346.

Almost surely, 2^1919429378 is an apocalyptic number.

1919429378 is a deficient number, since it is larger than the sum of its proper divisors (959714692).

1919429378 is an equidigital number, since it uses as much as digits as its factorization.

1919429378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959714691.

The product of its digits is 979776, while the sum is 53.

The square root of 1919429378 is about 43811.2928136114. The cubic root of 1919429378 is about 1242.7698613464.

The spelling of 1919429378 in words is "one billion, nine hundred nineteen million, four hundred twenty-nine thousand, three hundred seventy-eight".