1400645 has 4 divisors (see below), whose sum is σ = 1680780. Its totient is φ = 1120512.

The previous prime is 1400627. The next prime is 1400653. The reversal of 1400645 is 5460041.

It is a happy number.

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 543169 + 857476 = 737^2 + 926^2 .

It is a cyclic number.

It is not a de Polignac number, because 1400645 - 2¹⁰ = 1399621 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140060 + ... + 140069.

It is an arithmetic number, because the mean of its divisors is an integer number (420195).

2^1400645 is an apocalyptic number.

It is an amenable number.

1400645 is a deficient number, since it is larger than the sum of its proper divisors (280135).

1400645 is an equidigital number, since it uses as much as digits as its factorization.

1400645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280134.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1400645 is about 1183.4884874810. The cubic root of 1400645 is about 111.8860714364.

Adding to 1400645 its reverse (5460041), we get a palindrome (6860686).

The spelling of 1400645 in words is "one million, four hundred thousand, six hundred forty-five".