145222400 has 54 divisors (see below), whose sum is σ = 359463972. Its totient is φ = 58086400.

The previous prime is 145222393. The next prime is 145222463. The reversal of 145222400 is 4222541.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4946 + ... + 17745.

Almost surely, 2^145222400 is an apocalyptic number.

145222400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145222400 is an abundant number, since it is smaller than the sum of its proper divisors (214241572).

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

145222400 is an equidigital number, since it uses as much as digits as its factorization.

145222400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22717 (or 22698 counting only the distinct ones).

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

The square root of 145222400 is about 12050.8256978516. The cubic root of 145222400 is about 525.6272472702.

Adding to 145222400 its reverse (4222541), we get a palindrome (149444941).

The spelling of 145222400 in words is "one hundred forty-five million, two hundred twenty-two thousand, four hundred".