1461639 has 4 divisors (see below), whose sum is σ = 1948856. Its totient is φ = 974424.

The previous prime is 1461637. The next prime is 1461641. The reversal of 1461639 is 9361641.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9361641 = 3 ⋅3120547.

It is an interprime number because it is at equal distance from previous prime (1461637) and next prime (1461641).

It is not a de Polignac number, because 1461639 - 2¹ = 1461637 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1461631) 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, 243604 + ... + 243609.

It is an arithmetic number, because the mean of its divisors is an integer number (487214).

2^1461639 is an apocalyptic number.

1461639 is a deficient number, since it is larger than the sum of its proper divisors (487217).

1461639 is an equidigital number, since it uses as much as digits as its factorization.

1461639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487216.

The product of its digits is 3888, while the sum is 30.

The square root of 1461639 is about 1208.9826301482. The cubic root of 1461639 is about 113.4871546461.

The spelling of 1461639 in words is "one million, four hundred sixty-one thousand, six hundred thirty-nine".