1400009 has 4 divisors (see below), whose sum is σ = 1507716. Its totient is φ = 1292304.

The previous prime is 1399999. The next prime is 1400017. The reversal of 1400009 is 9000041.

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

It can be written as a sum of positive squares in 2 ways, for example, as 727609 + 672400 = 853^2 + 820^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1400009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1399966 and 1400002.

It is not an unprimeable number, because it can be changed into a prime (1400029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53834 + ... + 53859.

It is an arithmetic number, because the mean of its divisors is an integer number (376929).

2^1400009 is an apocalyptic number.

It is an amenable number.

1400009 is a deficient number, since it is larger than the sum of its proper divisors (107707).

1400009 is a wasteful number, since it uses less digits than its factorization.

1400009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107706.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1400009 is about 1183.2197598080. The cubic root of 1400009 is about 111.8691339267.

The spelling of 1400009 in words is "one million, four hundred thousand, nine".