19394249391 has 16 divisors (see below), whose sum is σ = 31344241920. Its totient is φ = 11754090360.

The previous prime is 19394249353. The next prime is 19394249401.

19394249391 is a `hidden beast` number, since 1 + 9 + 3 + 9 + 4 + 249 + 391 = 666.

19394249391 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 19394249391 - 2¹³ = 19394241199 is a prime.

It is a super-2 number, since 2×19394249391² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19394249191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32649955 + ... + 32650548.

It is an arithmetic number, because the mean of its divisors is an integer number (1959015120).

Almost surely, 2^19394249391 is an apocalyptic number.

19394249391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19394249391 is a deficient number, since it is larger than the sum of its proper divisors (11949992529).

19394249391 is a wasteful number, since it uses less digits than its factorization.

19394249391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65300523 (or 65300517 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 54.

The spelling of 19394249391 in words is "nineteen billion, three hundred ninety-four million, two hundred forty-nine thousand, three hundred ninety-one".