1283978773 has 16 divisors (see below), whose sum is σ = 1644073344. Its totient is φ = 973460160.

The previous prime is 1283978747. The next prime is 1283978777. The reversal of 1283978773 is 3778793821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1283978773 - 2²¹ = 1281881621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1283978777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222490 + ... + 228187.

It is an arithmetic number, because the mean of its divisors is an integer number (102754584).

Almost surely, 2^1283978773 is an apocalyptic number.

It is an amenable number.

1283978773 is a deficient number, since it is larger than the sum of its proper divisors (360094571).

1283978773 is a wasteful number, since it uses less digits than its factorization.

1283978773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450732.

The product of its digits is 3556224, while the sum is 55.

The square root of 1283978773 is about 35832.6495392121. The cubic root of 1283978773 is about 1086.8908883521.

The spelling of 1283978773 in words is "one billion, two hundred eighty-three million, nine hundred seventy-eight thousand, seven hundred seventy-three".