1396978199 has 4 divisors (see below), whose sum is σ = 1431050880. Its totient is φ = 1362905520.

The previous prime is 1396978159. The next prime is 1396978201. The reversal of 1396978199 is 9918796931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1396978199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1396978139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17036279 + ... + 17036360.

It is an arithmetic number, because the mean of its divisors is an integer number (357762720).

Almost surely, 2^1396978199 is an apocalyptic number.

1396978199 is a deficient number, since it is larger than the sum of its proper divisors (34072681).

1396978199 is an equidigital number, since it uses as much as digits as its factorization.

1396978199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34072680.

The product of its digits is 6613488, while the sum is 62.

The square root of 1396978199 is about 37376.1715401671. The cubic root of 1396978199 is about 1117.8834919760.

The spelling of 1396978199 in words is "one billion, three hundred ninety-six million, nine hundred seventy-eight thousand, one hundred ninety-nine".