1399431607 has 4 divisors (see below), whose sum is σ = 1599350416. Its totient is φ = 1199512800.

The previous prime is 1399431599. The next prime is 1399431617. The reversal of 1399431607 is 7061349931.

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

It is a cyclic number.

It is not a de Polignac number, because 1399431607 - 2³ = 1399431599 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 (1399431617) 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, 99959394 + ... + 99959407.

It is an arithmetic number, because the mean of its divisors is an integer number (399837604).

Almost surely, 2^1399431607 is an apocalyptic number.

1399431607 is a deficient number, since it is larger than the sum of its proper divisors (199918809).

1399431607 is an equidigital number, since it uses as much as digits as its factorization.

1399431607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199918808.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 1399431607 is about 37408.9776256984. The cubic root of 1399431607 is about 1118.5375275494.

The spelling of 1399431607 in words is "one billion, three hundred ninety-nine million, four hundred thirty-one thousand, six hundred seven".