145897920 has 168 divisors, whose sum is σ = 573597024. Its totient is φ = 33343488.

The previous prime is 145897891. The next prime is 145897931. The reversal of 145897920 is 29798541.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 16542 + ... + 23778.

It is an arithmetic number, because the mean of its divisors is an integer number (3414268).

Almost surely, 2^145897920 is an apocalyptic number.

145897920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 145897920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286798512).

145897920 is an abundant number, since it is smaller than the sum of its proper divisors (427699104).

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

145897920 is a wasteful number, since it uses less digits than its factorization.

145897920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7267 (or 7254 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 145897920 is about 12078.8211345313. The cubic root of 145897920 is about 526.4409935956.

The spelling of 145897920 in words is "one hundred forty-five million, eight hundred ninety-seven thousand, nine hundred twenty".