19490988405 has 64 divisors (see below), whose sum is σ = 37587916800. Its totient is φ = 8425140480.

The previous prime is 19490988397. The next prime is 19490988431. The reversal of 19490988405 is 50488909491.

It is not a de Polignac number, because 19490988405 - 2³ = 19490988397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1070266 + ... + 1088324.

It is an arithmetic number, because the mean of its divisors is an integer number (587311200).

Almost surely, 2^19490988405 is an apocalyptic number.

19490988405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19490988405 is a deficient number, since it is larger than the sum of its proper divisors (18096928395).

19490988405 is a wasteful number, since it uses less digits than its factorization.

19490988405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18634.

The product of its (nonzero) digits is 3732480, while the sum is 57.

The spelling of 19490988405 in words is "nineteen billion, four hundred ninety million, nine hundred eighty-eight thousand, four hundred five".