145439840 has 144 divisors (see below), whose sum is σ = 430747632. Its totient is φ = 45997056.

The previous prime is 145439839. The next prime is 145439849. The reversal of 145439840 is 48934541.

It is a junction number, because it is equal to n+sod(n) for n = 145439794 and 145439803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145439849) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101207 + ... + 102633.

It is an arithmetic number, because the mean of its divisors is an integer number (2991303).

Almost surely, 2^145439840 is an apocalyptic number.

145439840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 145439840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215373816).

145439840 is an abundant number, since it is smaller than the sum of its proper divisors (285307792).

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

145439840 is a wasteful number, since it uses less digits than its factorization.

145439840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469 (or 1454 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 145439840 is about 12059.8441117620. The cubic root of 145439840 is about 525.8894551966.

The spelling of 145439840 in words is "one hundred forty-five million, four hundred thirty-nine thousand, eight hundred forty".