145638999 has 16 divisors (see below), whose sum is σ = 235376640. Its totient is φ = 88265880.

The previous prime is 145638973. The next prime is 145639003. The reversal of 145638999 is 999836541.

145638999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145638999 - 2⁹ = 145638487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145638959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244887 + ... + 245480.

It is an arithmetic number, because the mean of its divisors is an integer number (14711040).

Almost surely, 2^145638999 is an apocalyptic number.

145638999 is a deficient number, since it is larger than the sum of its proper divisors (89737641).

145638999 is a wasteful number, since it uses less digits than its factorization.

145638999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490387 (or 490381 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 54.

The square root of 145638999 is about 12068.0984003280. The cubic root of 145638999 is about 526.1293891046.

The spelling of 145638999 in words is "one hundred forty-five million, six hundred thirty-eight thousand, nine hundred ninety-nine".