1899495405 has 54 divisors (see below), whose sum is σ = 3376107774. Its totient is φ = 987959808.

The previous prime is 1899495347. The next prime is 1899495427. The reversal of 1899495405 is 5045949981.

1899495405 is a `hidden beast` number, since 1 + 8 + 9 + 94 + 9 + 540 + 5 = 666.

It can be written as a sum of positive squares in 9 ways, for example, as 840188196 + 1059307209 = 28986^2 + 32547^2 .

It is not a de Polignac number, because 1899495405 - 2⁷ = 1899495277 is a prime.

It is a super-3 number, since 3×1899495405³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 21342601 + ... + 21342689.

Almost surely, 2^1899495405 is an apocalyptic number.

1899495405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1899495405 is a deficient number, since it is larger than the sum of its proper divisors (1476612369).

1899495405 is an frugal number, since it uses more digits than its factorization.

1899495405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The square root of 1899495405 is about 43583.2009494484. The cubic root of 1899495405 is about 1238.4526756490.

The spelling of 1899495405 in words is "one billion, eight hundred ninety-nine million, four hundred ninety-five thousand, four hundred five".