1905632849 has 4 divisors (see below), whose sum is σ = 1949949936. Its totient is φ = 1861315764.

The previous prime is 1905632821. The next prime is 1905632879. The reversal of 1905632849 is 9482365091.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9482365091 = 103 ⋅92061797.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1905632849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1905632819) 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, 22158479 + ... + 22158564.

It is an arithmetic number, because the mean of its divisors is an integer number (487487484).

Almost surely, 2^1905632849 is an apocalyptic number.

It is an amenable number.

1905632849 is a deficient number, since it is larger than the sum of its proper divisors (44317087).

1905632849 is an equidigital number, since it uses as much as digits as its factorization.

1905632849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44317086.

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 1905632849 is about 43653.5548266118. The cubic root of 1905632849 is about 1239.7850930458.

The spelling of 1905632849 in words is "one billion, nine hundred five million, six hundred thirty-two thousand, eight hundred forty-nine".