1245078397 has 4 divisors (see below), whose sum is σ = 1246301280. Its totient is φ = 1243855516.

The previous prime is 1245078383. The next prime is 1245078407. The reversal of 1245078397 is 7938705421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1245078397 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 (1245078337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609913 + ... + 611950.

It is an arithmetic number, because the mean of its divisors is an integer number (311575320).

Almost surely, 2^1245078397 is an apocalyptic number.

It is an amenable number.

1245078397 is a deficient number, since it is larger than the sum of its proper divisors (1222883).

1245078397 is a wasteful number, since it uses less digits than its factorization.

1245078397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222882.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 1245078397 is about 35285.6684363496. The cubic root of 1245078397 is about 1075.8017158454.

The spelling of 1245078397 in words is "one billion, two hundred forty-five million, seventy-eight thousand, three hundred ninety-seven".