1891454908 has 18 divisors (see below), whose sum is σ = 3783370136. Its totient is φ = 810524904.

The previous prime is 1891454899. The next prime is 1891454909. The reversal of 1891454908 is 8094541981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891454909) 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 5 ways as a sum of consecutive naturals, for example, 226023 + ... + 234241.

Almost surely, 2^1891454908 is an apocalyptic number.

It is an amenable number.

1891454908 is an abundant number, since it is smaller than the sum of its proper divisors (1891915228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1891454908 is an frugal number, since it uses more digits than its factorization.

1891454908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16449 (or 8228 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 49.

The square root of 1891454908 is about 43490.8600512797. The cubic root of 1891454908 is about 1236.7027620605.

The spelling of 1891454908 in words is "one billion, eight hundred ninety-one million, four hundred fifty-four thousand, nine hundred eight".