145539420 has 144 divisors (see below), whose sum is σ = 456486912. Its totient is φ = 34594560.

The previous prime is 145539413. The next prime is 145539439. The reversal of 145539420 is 24935541.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 314109 + ... + 314571.

It is an arithmetic number, because the mean of its divisors is an integer number (3170048).

Almost surely, 2^145539420 is an apocalyptic number.

145539420 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 145539420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228243456).

145539420 is an abundant number, since it is smaller than the sum of its proper divisors (310947492).

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

145539420 is a wasteful number, since it uses less digits than its factorization.

145539420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532 (or 517 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 145539420 is about 12063.9719827261. The cubic root of 145539420 is about 526.0094501138.

The spelling of 145539420 in words is "one hundred forty-five million, five hundred thirty-nine thousand, four hundred twenty".