2039661 has 30 divisors (see below), whose sum is σ = 3321450. Its totient is φ = 1246752.

The previous prime is 2039651. The next prime is 2039671. The reversal of 2039661 is 1669302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2039651) and next prime (2039671).

It can be written as a sum of positive squares in 3 ways, for example, as 93636 + 1946025 = 306^2 + 1395^2 .

It is not a de Polignac number, because 2039661 - 2⁵ = 2039629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2039621) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 13615 + ... + 13763.

It is an arithmetic number, because the mean of its divisors is an integer number (110715).

2^2039661 is an apocalyptic number.

It is an amenable number.

2039661 is a deficient number, since it is larger than the sum of its proper divisors (1281789).

2039661 is a wasteful number, since it uses less digits than its factorization.

2039661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 2039661 is about 1428.1670070408. The cubic root of 2039661 is about 126.8194885244.

The spelling of 2039661 in words is "two million, thirty-nine thousand, six hundred sixty-one".