145523730 has 64 divisors (see below), whose sum is σ = 386436096. Its totient is φ = 34776000.

The previous prime is 145523713. The next prime is 145523731. The reversal of 145523730 is 37325541.

145523730 = 455² + 456² + ... + 809².

It is a super-2 number, since 2×145523730² = 42354311986225800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (145523731) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20325 + ... + 26535.

It is an arithmetic number, because the mean of its divisors is an integer number (6038064).

Almost surely, 2^145523730 is an apocalyptic number.

145523730 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 145523730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (193218048).

145523730 is an abundant number, since it is smaller than the sum of its proper divisors (240912366).

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

145523730 is a wasteful number, since it uses less digits than its factorization.

145523730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6303.

The product of its (nonzero) digits is 12600, while the sum is 30.

The square root of 145523730 is about 12063.3216818586. The cubic root of 145523730 is about 525.9905471370.

The spelling of 145523730 in words is "one hundred forty-five million, five hundred twenty-three thousand, seven hundred thirty".