1958379887 has 4 divisors (see below), whose sum is σ = 1960022640. Its totient is φ = 1956737136.

The previous prime is 1958379881. The next prime is 1958379893. The reversal of 1958379887 is 7889738591.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (1958379881) and next prime (1958379893).

It is a cyclic number.

It is not a de Polignac number, because 1958379887 - 2¹² = 1958375791 is a prime.

It is a super-2 number, since 2×1958379887² = 7670503563612265538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1958379881) 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, 819587 + ... + 821972.

It is an arithmetic number, because the mean of its divisors is an integer number (490005660).

Almost surely, 2^1958379887 is an apocalyptic number.

1958379887 is a deficient number, since it is larger than the sum of its proper divisors (1642753).

1958379887 is a wasteful number, since it uses less digits than its factorization.

1958379887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642752.

The product of its digits is 30481920, while the sum is 65.

The square root of 1958379887 is about 44253.5861484694. The cubic root of 1958379887 is about 1251.1200386710.

The spelling of 1958379887 in words is "one billion, nine hundred fifty-eight million, three hundred seventy-nine thousand, eight hundred eighty-seven".