1988491 has 8 divisors (see below), whose sum is σ = 2059904. Its totient is φ = 1918080.

The previous prime is 1988471. The next prime is 1988513. The reversal of 1988491 is 1948891.

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

It is not a de Polignac number, because 1988491 - 2¹¹ = 1986443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8131 + ... + 8371.

It is an arithmetic number, because the mean of its divisors is an integer number (257488).

2^1988491 is an apocalyptic number.

1988491 is a deficient number, since it is larger than the sum of its proper divisors (71413).

1988491 is a wasteful number, since it uses less digits than its factorization.

1988491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501.

The product of its digits is 20736, while the sum is 40.

The square root of 1988491 is about 1410.1386456657. The cubic root of 1988491 is about 125.7499660750.

The spelling of 1988491 in words is "one million, nine hundred eighty-eight thousand, four hundred ninety-one".