1891448745 has 8 divisors (see below), whose sum is σ = 3026318016. Its totient is φ = 1008772656.

The previous prime is 1891448711. The next prime is 1891448807. The reversal of 1891448745 is 5478441981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1891448745 - 2⁶ = 1891448681 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63048277 + ... + 63048306.

It is an arithmetic number, because the mean of its divisors is an integer number (378289752).

Almost surely, 2^1891448745 is an apocalyptic number.

1891448745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1891448745 is a deficient number, since it is larger than the sum of its proper divisors (1134869271).

1891448745 is a wasteful number, since it uses less digits than its factorization.

1891448745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126096591.

The product of its digits is 1290240, while the sum is 51.

The square root of 1891448745 is about 43490.7891972542. The cubic root of 1891448745 is about 1236.7014188604.

The spelling of 1891448745 in words is "one billion, eight hundred ninety-one million, four hundred forty-eight thousand, seven hundred forty-five".