1992378319 has 4 divisors (see below), whose sum is σ = 2001155544. Its totient is φ = 1983601096.

The previous prime is 1992378307. The next prime is 1992378347. The reversal of 1992378319 is 9138732991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9138732991 = 23 ⋅397336217.

It is a cyclic number.

It is not a de Polignac number, because 1992378319 - 2⁵ = 1992378287 is a prime.

It is a super-2 number, since 2×1992378319² = 7939142732042531522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1992378389) 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, 4388272 + ... + 4388725.

It is an arithmetic number, because the mean of its divisors is an integer number (500288886).

Almost surely, 2^1992378319 is an apocalyptic number.

1992378319 is a deficient number, since it is larger than the sum of its proper divisors (8777225).

1992378319 is an equidigital number, since it uses as much as digits as its factorization.

1992378319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8777224.

The product of its digits is 734832, while the sum is 52.

The square root of 1992378319 is about 44636.0652275713. The cubic root of 1992378319 is about 1258.3185598351.

The spelling of 1992378319 in words is "one billion, nine hundred ninety-two million, three hundred seventy-eight thousand, three hundred nineteen".