19433442397 has 4 divisors (see below), whose sum is σ = 19435096540. Its totient is φ = 19431788256.

The previous prime is 19433442377. The next prime is 19433442437. The reversal of 19433442397 is 79324433491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79324433491 = 1607 ⋅49361813.

It can be written as a sum of positive squares in 2 ways, for example, as 18711230521 + 722211876 = 136789^2 + 26874^2 .

It is a cyclic number.

It is not a de Polignac number, because 19433442397 - 2¹¹ = 19433440349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19433442397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19433442377) 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, 809322 + ... + 832987.

It is an arithmetic number, because the mean of its divisors is an integer number (4858774135).

Almost surely, 2^19433442397 is an apocalyptic number.

It is an amenable number.

19433442397 is a deficient number, since it is larger than the sum of its proper divisors (1654143).

19433442397 is a wasteful number, since it uses less digits than its factorization.

19433442397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654142.

The product of its digits is 1959552, while the sum is 49.

The spelling of 19433442397 in words is "nineteen billion, four hundred thirty-three million, four hundred forty-two thousand, three hundred ninety-seven".