145998889 has 9 divisors (see below), whose sum is σ = 150006999. Its totient is φ = 142096080.

The previous prime is 145998877. The next prime is 145998901. The reversal of 145998889 is 988899541.

The square root of 145998889 is 12083.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (145998877) and next prime (145998901).

It can be written as a sum of positive squares in only one way, i.e., 98664489 + 47334400 = 9933^2 + 6880^2 .

It is not a de Polignac number, because 145998889 - 2⁷ = 145998761 is a prime.

It is a Duffinian number.

Its product of digits (7464960) is a multiple of the sum of its prime divisors (324).

It is not an unprimeable number, because it can be changed into a prime (145998389) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 519429 + ... + 519709.

Almost surely, 2^145998889 is an apocalyptic number.

145998889 is the 12083-rd square number.

145998889 is the 6042-nd centered octagonal number.

It is an amenable number.

145998889 is a deficient number, since it is larger than the sum of its proper divisors (4008110).

145998889 is an frugal number, since it uses more digits than its factorization.

145998889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648 (or 324 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 61.

The cubic root of 145998889 is about 526.5624071692.

The spelling of 145998889 in words is "one hundred forty-five million, nine hundred ninety-eight thousand, eight hundred eighty-nine".