145999998 has 48 divisors (see below), whose sum is σ = 334803456. Its totient is φ = 45885840.

The previous prime is 145999991. The next prime is 145999999. The reversal of 145999998 is 899999541.

145999998 is a `hidden beast` number, since 1 + 459 + 9 + 99 + 98 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145999991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26911 + ... + 31877.

It is an arithmetic number, because the mean of its divisors is an integer number (6975072).

Almost surely, 2^145999998 is an apocalyptic number.

145999998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 145999998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167401728).

145999998 is an abundant number, since it is smaller than the sum of its proper divisors (188803458).

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

145999998 is a wasteful number, since it uses less digits than its factorization.

145999998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5069 (or 5066 counting only the distinct ones).

The product of its digits is 9447840, while the sum is 63.

The square root of 145999998 is about 12083.0458908340. The cubic root of 145999998 is about 526.5637404127.

The spelling of 145999998 in words is "one hundred forty-five million, nine hundred ninety-nine thousand, nine hundred ninety-eight".