1245399 has 4 divisors (see below), whose sum is σ = 1660536. Its totient is φ = 830264.

The previous prime is 1245397. The next prime is 1245401. The reversal of 1245399 is 9935421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9935421 = 3 ⋅3311807.

It is an interprime number because it is at equal distance from previous prime (1245397) and next prime (1245401).

It is a cyclic number.

It is not a de Polignac number, because 1245399 - 2¹ = 1245397 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245397) 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, 207564 + ... + 207569.

It is an arithmetic number, because the mean of its divisors is an integer number (415134).

2^1245399 is an apocalyptic number.

1245399 is a deficient number, since it is larger than the sum of its proper divisors (415137).

1245399 is an equidigital number, since it uses as much as digits as its factorization.

1245399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415136.

The product of its digits is 9720, while the sum is 33.

The square root of 1245399 is about 1115.9744620734. The cubic root of 1245399 is about 107.5894046218.

The spelling of 1245399 in words is "one million, two hundred forty-five thousand, three hundred ninety-nine".