145523994 has 64 divisors (see below), whose sum is σ = 364649472. Its totient is φ = 37612800.

The previous prime is 145523981. The next prime is 145524007. The reversal of 145523994 is 499325541.

It is an interprime number because it is at equal distance from previous prime (145523981) and next prime (145524007).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 110689 + ... + 111995.

It is an arithmetic number, because the mean of its divisors is an integer number (5697648).

Almost surely, 2^145523994 is an apocalyptic number.

145523994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 145523994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182324736).

145523994 is an abundant number, since it is smaller than the sum of its proper divisors (219125478).

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

145523994 is a wasteful number, since it uses less digits than its factorization.

145523994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571.

The product of its digits is 194400, while the sum is 42.

The square root of 145523994 is about 12063.3326241135. The cubic root of 145523994 is about 525.9908652098.

The spelling of 145523994 in words is "one hundred forty-five million, five hundred twenty-three thousand, nine hundred ninety-four".