1287974440 has 32 divisors (see below), whose sum is σ = 2976268680. Its totient is φ = 501265152.

The previous prime is 1287974407. The next prime is 1287974491. The reversal of 1287974440 is 444797821.

It can be written as a sum of positive squares in 4 ways, for example, as 1241434756 + 46539684 = 35234^2 + 6822^2 .

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 433647 + ... + 436606.

Almost surely, 2^1287974440 is an apocalyptic number.

1287974440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287974440 is an abundant number, since it is smaller than the sum of its proper divisors (1688294240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1287974440 is a wasteful number, since it uses less digits than its factorization.

1287974440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870301 (or 870297 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 46.

The square root of 1287974440 is about 35888.3607873082. The cubic root of 1287974440 is about 1088.0171678555.

The spelling of 1287974440 in words is "one billion, two hundred eighty-seven million, nine hundred seventy-four thousand, four hundred forty".