1400665 has 12 divisors (see below), whose sum is σ = 1955556. Its totient is φ = 960288.

The previous prime is 1400653. The next prime is 1400669. The reversal of 1400665 is 5660041.

It can be written as a sum of positive squares in 2 ways, for example, as 659344 + 741321 = 812^2 + 861^2 .

It is not a de Polignac number, because 1400665 - 2¹³ = 1392473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1400669) 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 11 ways as a sum of consecutive naturals, for example, 2614 + ... + 3103.

It is an arithmetic number, because the mean of its divisors is an integer number (162963).

2^1400665 is an apocalyptic number.

It is an amenable number.

1400665 is a deficient number, since it is larger than the sum of its proper divisors (554891).

1400665 is an equidigital number, since it uses as much as digits as its factorization.

1400665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5736 (or 5729 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1400665 is about 1183.4969370472. The cubic root of 1400665 is about 111.8866039793.

The spelling of 1400665 in words is "one million, four hundred thousand, six hundred sixty-five".