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1958 = 21189

1958 has 8 divisors (see below), whose sum is σ = 3240. Its totient is φ = 880.

The previous prime is 1951. The next prime is 1973. The reversal of 1958 is 8591.

1958 is nontrivially palindromic in base 15.

It is a sphenic number, since it is the product of 3 distinct primes.

1958 is an undulating number in base 15.

It is a Curzon number.

It is a partition number, being equal to the number of ways a set of 25 identical objects can be partitioned into subset.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1951) by changing a digit.

1958 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23 + ... + 66.

It is an arithmetic number, because the mean of its divisors is an integer number (405).

1958 is a deficient number, since it is larger than the sum of its proper divisors (1282).

1958 is a wasteful number, since it uses less digits than its factorization.

1958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102.

The product of its digits is 360, while the sum is 23.

The square root of 1958 is about 44.2492937797. The cubic root of 1958 is about 12.5103913592.

It can be divided in two parts, 19 and 58, that added together give a palindrome (77).

The spelling of 1958 in words is "one thousand, nine hundred fifty-eight".

Divisors: 1 2 11 22 89 178 979 1958