1283493478 has 4 divisors (see below), whose sum is σ = 1925240220. Its totient is φ = 641746738.

The previous prime is 1283493469. The next prime is 1283493499. The reversal of 1283493478 is 8743943821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8743943821 = 239 ⋅36585539.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320873368 + ... + 320873371.

It is an arithmetic number, because the mean of its divisors is an integer number (481310055).

Almost surely, 2^1283493478 is an apocalyptic number.

1283493478 is a deficient number, since it is larger than the sum of its proper divisors (641746742).

1283493478 is an equidigital number, since it uses as much as digits as its factorization.

1283493478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641746741.

The product of its digits is 1161216, while the sum is 49.

The square root of 1283493478 is about 35825.8772118702. The cubic root of 1283493478 is about 1086.7539366640.

The spelling of 1283493478 in words is "one billion, two hundred eighty-three million, four hundred ninety-three thousand, four hundred seventy-eight".