1438661 has 16 divisors (see below), whose sum is σ = 1795200. Its totient is φ = 1124928.

The previous prime is 1438643. The next prime is 1438663. The reversal of 1438661 is 1668341.

It is not a de Polignac number, because 1438661 - 2¹⁴ = 1422277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1438663) 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 15 ways as a sum of consecutive naturals, for example, 3671 + ... + 4043.

It is an arithmetic number, because the mean of its divisors is an integer number (112200).

2^1438661 is an apocalyptic number.

It is an amenable number.

1438661 is a deficient number, since it is larger than the sum of its proper divisors (356539).

1438661 is a wasteful number, since it uses less digits than its factorization.

1438661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428.

The product of its digits is 3456, while the sum is 29.

The square root of 1438661 is about 1199.4419535767. The cubic root of 1438661 is about 112.8893112990.

The spelling of 1438661 in words is "one million, four hundred thirty-eight thousand, six hundred sixty-one".