1958139959 has 4 divisors (see below), whose sum is σ = 1959387960. Its totient is φ = 1956891960.

The previous prime is 1958139929. The next prime is 1958139973. The reversal of 1958139959 is 9599318591.

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

It is a cyclic number.

It is not a de Polignac number, because 1958139959 - 2²⁸ = 1689704503 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1958139898 and 1958139907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1958139929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621644 + ... + 624785.

It is an arithmetic number, because the mean of its divisors is an integer number (489846990).

Almost surely, 2^1958139959 is an apocalyptic number.

1958139959 is a deficient number, since it is larger than the sum of its proper divisors (1248001).

1958139959 is a wasteful number, since it uses less digits than its factorization.

1958139959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248000.

The product of its digits is 3936600, while the sum is 59.

The square root of 1958139959 is about 44250.8752342821. The cubic root of 1958139959 is about 1251.0689435472.

The spelling of 1958139959 in words is "one billion, nine hundred fifty-eight million, one hundred thirty-nine thousand, nine hundred fifty-nine".