1400389 has 4 divisors (see below), whose sum is σ = 1414924. Its totient is φ = 1385856.

The previous prime is 1400387. The next prime is 1400411. The reversal of 1400389 is 9830041.

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 664225 + 736164 = 815^2 + 858^2 .

It is a cyclic number.

It is not a de Polignac number, because 1400389 - 2¹ = 1400387 is a prime.

It is a super-2 number, since 2×1400389² = 3922178702642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1400383) 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, 7122 + ... + 7315.

It is an arithmetic number, because the mean of its divisors is an integer number (353731).

2^1400389 is an apocalyptic number.

It is an amenable number.

1400389 is a deficient number, since it is larger than the sum of its proper divisors (14535).

1400389 is an equidigital number, since it uses as much as digits as its factorization.

1400389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14534.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1400389 is about 1183.3803277053. The cubic root of 1400389 is about 111.8792544391.

The spelling of 1400389 in words is "one million, four hundred thousand, three hundred eighty-nine".