1489587997 has 4 divisors (see below), whose sum is σ = 1489666780. Its totient is φ = 1489509216.

The previous prime is 1489587989. The next prime is 1489588007. The reversal of 1489587997 is 7997859841.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7997859841 = 881 ⋅9078161.

It can be written as a sum of positive squares in 2 ways, for example, as 8415801 + 1481172196 = 2901^2 + 38486^2 .

It is a 3-Lehmer number, since φ(1489587997) divides (1489587997-1)³.

It is a cyclic number.

It is not a de Polignac number, because 1489587997 - 2³ = 1489587989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1489587907) 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, 7879 + ... + 55147.

It is an arithmetic number, because the mean of its divisors is an integer number (372416695).

It is a Poulet number, since it divides 2^1489587996-1.

Almost surely, 2^1489587997 is an apocalyptic number.

1489587997 is the 31513-rd pentagonal number.

It is an amenable number.

1489587997 is a deficient number, since it is larger than the sum of its proper divisors (78783).

1489587997 is an equidigital number, since it uses as much as digits as its factorization.

1489587997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78782.

The product of its digits is 45722880, while the sum is 67.

The square root of 1489587997 is about 38595.1810074781. The cubic root of 1489587997 is about 1142.0594753627.

The spelling of 1489587997 in words is "one billion, four hundred eighty-nine million, five hundred eighty-seven thousand, nine hundred ninety-seven".