145721250 has 60 divisors (see below), whose sum is σ = 394565886. Its totient is φ = 38856000.

The previous prime is 145721249. The next prime is 145721269. The reversal of 145721250 is 52127541.

145721250 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 2368521 + 143352729 = 1539^2 + 11973^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 4774 + ... + 17726.

Almost surely, 2^145721250 is an apocalyptic number.

145721250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 145721250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197282943).

145721250 is an abundant number, since it is smaller than the sum of its proper divisors (248844636).

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

145721250 is a wasteful number, since it uses less digits than its factorization.

145721250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12981 (or 12963 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 145721250 is about 12071.5057055862. The cubic root of 145721250 is about 526.2284159784.

Adding to 145721250 its reverse (52127541), we get a palindrome (197848791).

The spelling of 145721250 in words is "one hundred forty-five million, seven hundred twenty-one thousand, two hundred fifty".