1988491745 has 32 divisors (see below), whose sum is σ = 2540077056. Its totient is φ = 1492056000.

The previous prime is 1988491693. The next prime is 1988491763. The reversal of 1988491745 is 5471948891.

It is not a de Polignac number, because 1988491745 - 2¹⁸ = 1988229601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 778220 + ... + 780770.

It is an arithmetic number, because the mean of its divisors is an integer number (79377408).

Almost surely, 2^1988491745 is an apocalyptic number.

It is an amenable number.

1988491745 is a deficient number, since it is larger than the sum of its proper divisors (551585311).

1988491745 is a wasteful number, since it uses less digits than its factorization.

1988491745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741.

The product of its digits is 2903040, while the sum is 56.

The square root of 1988491745 is about 44592.5077227105. The cubic root of 1988491745 is about 1257.4998177930.

The spelling of 1988491745 in words is "one billion, nine hundred eighty-eight million, four hundred ninety-one thousand, seven hundred forty-five".