1299378242 has 18 divisors (see below), whose sum is σ = 1982427699. Its totient is φ = 638754340.

The previous prime is 1299378239. The next prime is 1299378277. The reversal of 1299378242 is 2428739921.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 649689121 + 649689121 = 25489^2 + 25489^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=25489.

It is a Duffinian number.

Its product of digits (435456) is a multiple of the sum of its prime divisors (432).

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3619259 + ... + 3619617.

Almost surely, 2^1299378242 is an apocalyptic number.

1299378242 is a deficient number, since it is larger than the sum of its proper divisors (683049457).

1299378242 is an frugal number, since it uses more digits than its factorization.

1299378242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862 (or 432 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The square root of 1299378242 is about 36046.8894913278. The cubic root of 1299378242 is about 1091.2188598642.

The spelling of 1299378242 in words is "one billion, two hundred ninety-nine million, three hundred seventy-eight thousand, two hundred forty-two".