1245323399 has 4 divisors (see below), whose sum is σ = 1246453536. Its totient is φ = 1244193264.

The previous prime is 1245323383. The next prime is 1245323407. The reversal of 1245323399 is 9933235421.

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: 9933235421 = 1669 ⋅5951609.

It is a cyclic number.

It is not a de Polignac number, because 1245323399 - 2⁴ = 1245323383 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 (1245323329) 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, 563414 + ... + 565619.

It is an arithmetic number, because the mean of its divisors is an integer number (311613384).

Almost surely, 2^1245323399 is an apocalyptic number.

1245323399 is a deficient number, since it is larger than the sum of its proper divisors (1130137).

1245323399 is a wasteful number, since it uses less digits than its factorization.

1245323399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130136.

The product of its digits is 174960, while the sum is 41.

The square root of 1245323399 is about 35289.1399583498. The cubic root of 1245323399 is about 1075.8722753342.

The spelling of 1245323399 in words is "one billion, two hundred forty-five million, three hundred twenty-three thousand, three hundred ninety-nine".