1887879949 has 2 divisors, whose sum is σ = 1887879950. Its totient is φ = 1887879948.

The previous prime is 1887879947. The next prime is 1887879991. The reversal of 1887879949 is 9499787881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1721005225 + 166874724 = 41485^2 + 12918^2 .

It is a cyclic number.

It is not a de Polignac number, because 1887879949 - 2¹ = 1887879947 is a prime.

Together with 1887879947, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1887879947) 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 as a sum of consecutive naturals, namely, 943939974 + 943939975.

It is an arithmetic number, because the mean of its divisors is an integer number (943939975).

Almost surely, 2^1887879949 is an apocalyptic number.

It is an amenable number.

1887879949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1887879949 is an equidigital number, since it uses as much as digits as its factorization.

1887879949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73156608, while the sum is 70.

The square root of 1887879949 is about 43449.7404940467. The cubic root of 1887879949 is about 1235.9231241221.

The spelling of 1887879949 in words is "one billion, eight hundred eighty-seven million, eight hundred seventy-nine thousand, nine hundred forty-nine".