145840 has 20 divisors (see below), whose sum is σ = 339264. Its totient is φ = 58304.

The previous prime is 145829. The next prime is 145861. The reversal of 145840 is 48541.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832 + ... + 991.

2¹⁴⁵⁸⁴⁰ is an apocalyptic number.

145840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145840 is an abundant number, since it is smaller than the sum of its proper divisors (193424).

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

145840 is a wasteful number, since it uses less digits than its factorization.

145840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836 (or 1830 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 145840 is about 381.8900365288. The cubic root of 145840 is about 52.6371320457.

The spelling of 145840 in words is "one hundred forty-five thousand, eight hundred forty".