19976345 has 4 divisors (see below), whose sum is σ = 23971620. Its totient is φ = 15981072.

The previous prime is 19976323. The next prime is 19976371. The reversal of 19976345 is 54367991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54367991 = 73 ⋅744767.

It can be written as a sum of positive squares in 2 ways, for example, as 5740816 + 14235529 = 2396^2 + 3773^2 .

It is a cyclic number.

It is not a de Polignac number, because 19976345 - 2¹⁰ = 19975321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19976296 and 19976305.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1997630 + ... + 1997639.

It is an arithmetic number, because the mean of its divisors is an integer number (5992905).

Almost surely, 2^19976345 is an apocalyptic number.

It is an amenable number.

19976345 is a deficient number, since it is larger than the sum of its proper divisors (3995275).

19976345 is an equidigital number, since it uses as much as digits as its factorization.

19976345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3995274.

The product of its digits is 204120, while the sum is 44.

The square root of 19976345 is about 4469.4904631289. The cubic root of 19976345 is about 271.3347035262.

The spelling of 19976345 in words is "nineteen million, nine hundred seventy-six thousand, three hundred forty-five".