145993 has 4 divisors (see below), whose sum is σ = 148240. Its totient is φ = 143748.

The previous prime is 145991. The next prime is 146009. The reversal of 145993 is 399541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a 3-Lehmer number, since φ(145993) divides (145993-1)³.

It is a cyclic number.

It is not a de Polignac number, because 145993 - 2¹ = 145991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145991) 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, 1023 + ... + 1156.

It is an arithmetic number, because the mean of its divisors is an integer number (37060).

2¹⁴⁵⁹⁹³ is an apocalyptic number.

It is an amenable number.

145993 is a deficient number, since it is larger than the sum of its proper divisors (2247).

145993 is an equidigital number, since it uses as much as digits as its factorization.

145993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246.

The product of its digits is 4860, while the sum is 31.

The square root of 145993 is about 382.0903034624. The cubic root of 145993 is about 52.6555327280.

The spelling of 145993 in words is "one hundred forty-five thousand, nine hundred ninety-three".