1287348938 has 4 divisors (see below), whose sum is σ = 1931023410. Its totient is φ = 643674468.

The previous prime is 1287348877. The next prime is 1287348973. The reversal of 1287348938 is 8398437821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8398437821 = 52667 ⋅159463.

It can be written as a sum of positive squares in only one way, i.e., 1092104209 + 195244729 = 33047^2 + 13973^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1287348938.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321837233 + ... + 321837236.

Almost surely, 2^1287348938 is an apocalyptic number.

1287348938 is a deficient number, since it is larger than the sum of its proper divisors (643674472).

1287348938 is an equidigital number, since it uses as much as digits as its factorization.

1287348938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643674471.

The product of its digits is 2322432, while the sum is 53.

The square root of 1287348938 is about 35879.6451766179. The cubic root of 1287348938 is about 1087.8410082741.

The spelling of 1287348938 in words is "one billion, two hundred eighty-seven million, three hundred forty-eight thousand, nine hundred thirty-eight".