1391494489 has 64 divisors (see below), whose sum is σ = 1934917632. Its totient is φ = 967449600.

The previous prime is 1391494477. The next prime is 1391494493. The reversal of 1391494489 is 9844941931.

It is not a de Polignac number, because 1391494489 - 2⁹ = 1391493977 is a prime.

It is a super-2 number, since 2×1391494489² = 3872513825834742242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1391494439) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2150364 + ... + 2151010.

It is an arithmetic number, because the mean of its divisors is an integer number (30233088).

Almost surely, 2^1391494489 is an apocalyptic number.

It is an amenable number.

1391494489 is a deficient number, since it is larger than the sum of its proper divisors (543423143).

1391494489 is a wasteful number, since it uses less digits than its factorization.

1391494489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766.

The product of its digits is 1119744, while the sum is 52.

The square root of 1391494489 is about 37302.7410386958. The cubic root of 1391494489 is about 1116.4188574434.

The spelling of 1391494489 in words is "one billion, three hundred ninety-one million, four hundred ninety-four thousand, four hundred eighty-nine".