1379999 has 8 divisors (see below), whose sum is σ = 1436160. Its totient is φ = 1325016.

The previous prime is 1379993. The next prime is 1380007. The reversal of 1379999 is 9999731.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1379999 - 2¹⁶ = 1314463 is a prime.

It is an Ulam number.

It is a Duffinian number.

1379999 is a modest number, since divided by 9999 gives 137 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1379993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2642 + ... + 3120.

It is an arithmetic number, because the mean of its divisors is an integer number (179520).

2^1379999 is an apocalyptic number.

1379999 is a deficient number, since it is larger than the sum of its proper divisors (56161).

1379999 is an equidigital number, since it uses as much as digits as its factorization.

1379999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589.

The product of its digits is 137781, while the sum is 47.

The square root of 1379999 is about 1174.7335868187. The cubic root of 1379999 is about 111.3336012599. Note that the first 3 decimals are identical.

The spelling of 1379999 in words is "one million, three hundred seventy-nine thousand, nine hundred ninety-nine".