1399999999 has 4 divisors (see below), whose sum is σ = 1413592336. Its totient is φ = 1386407664.

The previous prime is 1399999987. The next prime is 1400000023. The reversal of 1399999999 is 9999999931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9999999931 = 21893 ⋅456767.

It is a cyclic number.

It is not a de Polignac number, because 1399999999 - 2¹⁹ = 1399475711 is a prime.

It is a Duffinian number.

1399999999 is a modest number, since divided by 99999 gives 13999 as remainder.

It is a plaindrome in base 8 and base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1399993999) 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, 6796014 + ... + 6796219.

It is an arithmetic number, because the mean of its divisors is an integer number (353398084).

Almost surely, 2^1399999999 is an apocalyptic number.

1399999999 is a deficient number, since it is larger than the sum of its proper divisors (13592337).

1399999999 is a wasteful number, since it uses less digits than its factorization.

1399999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13592336.

The product of its digits is 129140163, while the sum is 76.

The square root of 1399999999 is about 37416.5738543764. The cubic root of 1399999999 is about 1118.6889418150.

It can be divided in two parts, 1 and 399999999, that added together give a square (400000000 = 20000²).

The spelling of 1399999999 in words is "one billion, three hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".