1283999397 has 4 divisors (see below), whose sum is σ = 1711999200. Its totient is φ = 855999596.

The previous prime is 1283999377. The next prime is 1283999407. The reversal of 1283999397 is 7939993821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7939993821 = 3 ⋅2646664607.

It is a cyclic number.

It is not a de Polignac number, because 1283999397 - 2⁶ = 1283999333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1283999397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1283999377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213999897 + ... + 213999902.

It is an arithmetic number, because the mean of its divisors is an integer number (427999800).

Almost surely, 2^1283999397 is an apocalyptic number.

It is an amenable number.

1283999397 is a deficient number, since it is larger than the sum of its proper divisors (427999803).

1283999397 is an equidigital number, since it uses as much as digits as its factorization.

1283999397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427999802.

The product of its digits is 6613488, while the sum is 60.

The square root of 1283999397 is about 35832.9373202923. The cubic root of 1283999397 is about 1086.8967077416.

The spelling of 1283999397 in words is "one billion, two hundred eighty-three million, nine hundred ninety-nine thousand, three hundred ninety-seven".