1399931 has 4 divisors (see below), whose sum is σ = 1507632. Its totient is φ = 1292232.

The previous prime is 1399919. The next prime is 1399943.

It is a happy number.

1399931 is nontrivially palindromic in base 10.

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

It is an interprime number because it is at equal distance from previous prime (1399919) and next prime (1399943).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1399931 is a prime.

It is a super-2 number, since 2×1399931² = 3919613609522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1399891 and 1399900.

It is not an unprimeable number, because it can be changed into a prime (1399231) 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, 53831 + ... + 53856.

It is an arithmetic number, because the mean of its divisors is an integer number (376908).

2^1399931 is an apocalyptic number.

1399931 is a deficient number, since it is larger than the sum of its proper divisors (107701).

1399931 is a wasteful number, since it uses less digits than its factorization.

1399931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107700.

The product of its digits is 6561, while the sum is 35.

The square root of 1399931 is about 1183.1867984389. The cubic root of 1399931 is about 111.8670563318.

The spelling of 1399931 in words is "one million, three hundred ninety-nine thousand, nine hundred thirty-one".