145244420 has 24 divisors (see below), whose sum is σ = 307978944. Its totient is φ = 57532896.

The previous prime is 145244401. The next prime is 145244443. The reversal of 145244420 is 24442541.

It is a super-2 number, since 2×145244420² = 42191883082272800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145244420.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33194 + ... + 37313.

It is an arithmetic number, because the mean of its divisors is an integer number (12832456).

Almost surely, 2^145244420 is an apocalyptic number.

145244420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145244420 is an abundant number, since it is smaller than the sum of its proper divisors (162734524).

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

145244420 is a wasteful number, since it uses less digits than its factorization.

145244420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70619 (or 70617 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 145244420 is about 12051.7392935626. The cubic root of 145244420 is about 525.6538127933.

Adding to 145244420 its reverse (24442541), we get a palindrome (169686961).

The spelling of 145244420 in words is "one hundred forty-five million, two hundred forty-four thousand, four hundred twenty".