19408920349 has 32 divisors (see below), whose sum is σ = 25308170496. Its totient is φ = 14444559360.

The previous prime is 19408920329. The next prime is 19408920359. The reversal of 19408920349 is 94302980491.

It is not a de Polignac number, because 19408920349 - 2²¹ = 19406823197 is a prime.

It is a super-2 number, since 2×19408920349² (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 (19408920319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3912979 + ... + 3917935.

It is an arithmetic number, because the mean of its divisors is an integer number (790880328).

Almost surely, 2^19408920349 is an apocalyptic number.

It is an amenable number.

19408920349 is a deficient number, since it is larger than the sum of its proper divisors (5899250147).

19408920349 is a wasteful number, since it uses less digits than its factorization.

19408920349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7525.

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 19408920349 in words is "nineteen billion, four hundred eight million, nine hundred twenty thousand, three hundred forty-nine".