1989497 has 4 divisors (see below), whose sum is σ = 2004816. Its totient is φ = 1974180.

The previous prime is 1989479. The next prime is 1989499. The reversal of 1989497 is 7949891.

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.

It is a cyclic number.

It is not a de Polignac number, because 1989497 - 2⁸ = 1989241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989499) 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, 7463 + ... + 7724.

It is an arithmetic number, because the mean of its divisors is an integer number (501204).

2^1989497 is an apocalyptic number.

It is an amenable number.

1989497 is a deficient number, since it is larger than the sum of its proper divisors (15319).

1989497 is a wasteful number, since it uses less digits than its factorization.

1989497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15318.

The product of its digits is 163296, while the sum is 47.

The square root of 1989497 is about 1410.4953030762. The cubic root of 1989497 is about 125.7711686080.

It can be divided in two parts, 19894 and 97, that added together give a palindrome (19991).

The spelling of 1989497 in words is "one million, nine hundred eighty-nine thousand, four hundred ninety-seven".