145042220 has 24 divisors (see below), whose sum is σ = 312822384. Its totient is φ = 56448576.

The previous prime is 145042199. The next prime is 145042229. The reversal of 145042220 is 22240541.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 145042192 and 145042201.

It is not an unprimeable number, because it can be changed into a prime (145042229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97262 + ... + 98741.

It is an arithmetic number, because the mean of its divisors is an integer number (13034266).

Almost surely, 2^145042220 is an apocalyptic number.

145042220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145042220 is an abundant number, since it is smaller than the sum of its proper divisors (167780164).

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

145042220 is a wasteful number, since it uses less digits than its factorization.

145042220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196049 (or 196047 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 145042220 is about 12043.3475412777. The cubic root of 145042220 is about 525.4097722965.

Adding to 145042220 its reverse (22240541), we get a palindrome (167282761).

The spelling of 145042220 in words is "one hundred forty-five million, forty-two thousand, two hundred twenty".