1399894079 has 4 divisors (see below), whose sum is σ = 1400526600. Its totient is φ = 1399261560.

The previous prime is 1399894073. The next prime is 1399894081. The reversal of 1399894079 is 9704989931.

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-1399894079 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 (1399894073) 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, 312929 + ... + 317370.

It is an arithmetic number, because the mean of its divisors is an integer number (350131650).

Almost surely, 2^1399894079 is an apocalyptic number.

1399894079 is a deficient number, since it is larger than the sum of its proper divisors (632521).

1399894079 is an equidigital number, since it uses as much as digits as its factorization.

1399894079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632520.

The product of its (nonzero) digits is 4408992, while the sum is 59.

The square root of 1399894079 is about 37415.1584120661. The cubic root of 1399894079 is about 1118.6607288338.

The spelling of 1399894079 in words is "one billion, three hundred ninety-nine million, eight hundred ninety-four thousand, seventy-nine".