19308397450 has 12 divisors (see below), whose sum is σ = 35913619350. Its totient is φ = 7723358960.

The previous prime is 19308397447. The next prime is 19308397487. The reversal of 19308397450 is 5479380391.

It can be written as a sum of positive squares in 3 ways, for example, as 8505081729 + 10803315721 = 92223^2 + 103939^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19308397394 and 19308397403.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 193083925 + ... + 193084024.

Almost surely, 2^19308397450 is an apocalyptic number.

19308397450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19308397450 is a deficient number, since it is larger than the sum of its proper divisors (16605221900).

19308397450 is a wasteful number, since it uses less digits than its factorization.

19308397450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386167961 (or 386167956 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 19308397450 in words is "nineteen billion, three hundred eight million, three hundred ninety-seven thousand, four hundred fifty".