145997839 has 8 divisors (see below), whose sum is σ = 160574400. Its totient is φ = 131899296.

The previous prime is 145997833. The next prime is 145997849. The reversal of 145997839 is 938799541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 145997839 - 2⁵ = 145997807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145997839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145997833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118864 + ... + 120085.

It is an arithmetic number, because the mean of its divisors is an integer number (20071800).

Almost surely, 2^145997839 is an apocalyptic number.

145997839 is a deficient number, since it is larger than the sum of its proper divisors (14576561).

145997839 is a wasteful number, since it uses less digits than its factorization.

145997839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239009.

The product of its digits is 2449440, while the sum is 55.

The square root of 145997839 is about 12082.9565504474. The cubic root of 145997839 is about 526.5611448494.

The spelling of 145997839 in words is "one hundred forty-five million, nine hundred ninety-seven thousand, eight hundred thirty-nine".