1299978 has 12 divisors (see below), whose sum is σ = 2816658. Its totient is φ = 433320.

The previous prime is 1299953. The next prime is 1299979. The reversal of 1299978 is 8799921.

It can be written as a sum of positive squares in only one way, i.e., 1225449 + 74529 = 1107^2 + 273^2 .

It is not an unprimeable number, because it can be changed into a prime (1299979) 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, 36093 + ... + 36128.

2^1299978 is an apocalyptic number.

1299978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1299978 is an abundant number, since it is smaller than the sum of its proper divisors (1516680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1299978 is a wasteful number, since it uses less digits than its factorization.

1299978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72229 (or 72226 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 1299978 is about 1140.1657774201. The cubic root of 1299978 is about 109.1386726451.

The spelling of 1299978 in words is "one million, two hundred ninety-nine thousand, nine hundred seventy-eight".