145420 has 24 divisors (see below), whose sum is σ = 333648. Its totient is φ = 52800.

The previous prime is 145417. The next prime is 145423. The reversal of 145420 is 24541.

It is an interprime number because it is at equal distance from previous prime (145417) and next prime (145423).

It is a super-2 number, since 2×145420² = 42293952800, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 145394 and 145403.

It is not an unprimeable number, because it can be changed into a prime (145423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111 + ... + 550.

It is an arithmetic number, because the mean of its divisors is an integer number (13902).

2¹⁴⁵⁴²⁰ is an apocalyptic number.

145420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145420 is an abundant number, since it is smaller than the sum of its proper divisors (188228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145420 is a wasteful number, since it uses less digits than its factorization.

145420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681 (or 679 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 145420 is about 381.3397435359. The cubic root of 145420 is about 52.5865541251.

Adding to 145420 its reverse (24541), we get a palindrome (169961).

It can be divided in two parts, 145 and 420, that added together give a palindrome (565).

The spelling of 145420 in words is "one hundred forty-five thousand, four hundred twenty".