145903220 has 24 divisors (see below), whose sum is σ = 310972704. Its totient is φ = 57489696.

The previous prime is 145903217. The next prime is 145903243. The reversal of 145903220 is 22309541.

It is a self number, because there is not a number n which added to its sum of digits gives 145903220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53102 + ... + 55781.

It is an arithmetic number, because the mean of its divisors is an integer number (12957196).

Almost surely, 2^145903220 is an apocalyptic number.

145903220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145903220 is an abundant number, since it is smaller than the sum of its proper divisors (165069484).

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

145903220 is a wasteful number, since it uses less digits than its factorization.

145903220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108959 (or 108957 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 145903220 is about 12079.0405248099. The cubic root of 145903220 is about 526.4473681518.

The spelling of 145903220 in words is "one hundred forty-five million, nine hundred three thousand, two hundred twenty".