1955942639 has 4 divisors (see below), whose sum is σ = 2235363024. Its totient is φ = 1676522256.

The previous prime is 1955942627. The next prime is 1955942657. The reversal of 1955942639 is 9362495591.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1955942639 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 (1955942239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139710182 + ... + 139710195.

It is an arithmetic number, because the mean of its divisors is an integer number (558840756).

Almost surely, 2^1955942639 is an apocalyptic number.

1955942639 is a deficient number, since it is larger than the sum of its proper divisors (279420385).

1955942639 is an equidigital number, since it uses as much as digits as its factorization.

1955942639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279420384.

The product of its digits is 2624400, while the sum is 53.

The square root of 1955942639 is about 44226.0402817164. The cubic root of 1955942639 is about 1250.6008074980.

The spelling of 1955942639 in words is "one billion, nine hundred fifty-five million, nine hundred forty-two thousand, six hundred thirty-nine".