1955639 has 12 divisors (see below), whose sum is σ = 2302344. Its totient is φ = 1656144.

The previous prime is 1955633. The next prime is 1955641. The reversal of 1955639 is 9365591.

It is not a de Polignac number, because 1955639 - 2¹⁶ = 1890103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1955633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5057 + ... + 5429.

It is an arithmetic number, because the mean of its divisors is an integer number (191862).

2^1955639 is an apocalyptic number.

1955639 is a deficient number, since it is larger than the sum of its proper divisors (346705).

1955639 is a wasteful number, since it uses less digits than its factorization.

1955639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 487 counting only the distinct ones).

The product of its digits is 36450, while the sum is 38.

The square root of 1955639 is about 1398.4416326755. The cubic root of 1955639 is about 125.0536090053.

The spelling of 1955639 in words is "one million, nine hundred fifty-five thousand, six hundred thirty-nine".