1287974439 has 20 divisors (see below), whose sum is σ = 1943858224. Its totient is φ = 849792384.

The previous prime is 1287974407. The next prime is 1287974491. The reversal of 1287974439 is 9344797821.

1287974439 is a `hidden beast` number, since 128 + 79 + 7 + 443 + 9 = 666.

It is not a de Polignac number, because 1287974439 - 2⁵ = 1287974407 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 (1287979439) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 74107 + ... + 89820.

Almost surely, 2^1287974439 is an apocalyptic number.

1287974439 is a deficient number, since it is larger than the sum of its proper divisors (655883785).

1287974439 is an equidigital number, since it uses as much as digits as its factorization.

1287974439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164036 (or 164027 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 54.

The square root of 1287974439 is about 35888.3607733761. The cubic root of 1287974439 is about 1088.0171675740.

The spelling of 1287974439 in words is "one billion, two hundred eighty-seven million, nine hundred seventy-four thousand, four hundred thirty-nine".