145699 has 4 divisors (see below), whose sum is σ = 146464. Its totient is φ = 144936.

The previous prime is 145687. The next prime is 145703. The reversal of 145699 is 996541.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 145699 - 2¹¹ = 143651 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (145679) 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, 169 + ... + 565.

It is an arithmetic number, because the mean of its divisors is an integer number (36616).

2¹⁴⁵⁶⁹⁹ is an apocalyptic number.

145699 is a deficient number, since it is larger than the sum of its proper divisors (765).

145699 is an equidigital number, since it uses as much as digits as its factorization.

145699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764.

The product of its digits is 9720, while the sum is 34.

The square root of 145699 is about 381.7053837713. The cubic root of 145699 is about 52.6201631557.

The spelling of 145699 in words is "one hundred forty-five thousand, six hundred ninety-nine".