145669 has 8 divisors (see below), whose sum is σ = 155648. Its totient is φ = 136080.

The previous prime is 145661. The next prime is 145679. The reversal of 145669 is 966541.

145669 = T₂₂ + T₂₃ + ... + T₉₅.

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

It is a cyclic number.

It is not a de Polignac number, because 145669 - 2³ = 145661 is a prime.

It is a super-2 number, since 2×145669² = 42438915122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a plaindrome in base 7 and base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 145669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145661) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1084 + ... + 1210.

It is an arithmetic number, because the mean of its divisors is an integer number (19456).

2¹⁴⁵⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

145669 is a deficient number, since it is larger than the sum of its proper divisors (9979).

145669 is a wasteful number, since it uses less digits than its factorization.

145669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195.

The product of its digits is 6480, while the sum is 31.

The square root of 145669 is about 381.6660844246. Note that the first 3 decimals coincide. The cubic root of 145669 is about 52.6165513412.

The spelling of 145669 in words is "one hundred forty-five thousand, six hundred sixty-nine".