1287234783 has 6 divisors (see below), whose sum is σ = 1859339144. Its totient is φ = 858156516.

The previous prime is 1287234779. The next prime is 1287234787. The reversal of 1287234783 is 3874327821.

It is an interprime number because it is at equal distance from previous prime (1287234779) and next prime (1287234787).

It is not a de Polignac number, because 1287234783 - 2² = 1287234779 is a prime.

It is a super-3 number, since 3×1287234783³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287234787) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71513035 + ... + 71513052.

Almost surely, 2^1287234783 is an apocalyptic number.

1287234783 is a deficient number, since it is larger than the sum of its proper divisors (572104361).

1287234783 is a wasteful number, since it uses less digits than its factorization.

1287234783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143026093 (or 143026090 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 1287234783 is about 35878.0543368784. The cubic root of 1287234783 is about 1087.8088527444.

The spelling of 1287234783 in words is "one billion, two hundred eighty-seven million, two hundred thirty-four thousand, seven hundred eighty-three".