145989381 has 8 divisors (see below), whose sum is σ = 195429024. Its totient is φ = 96938000.

The previous prime is 145989373. The next prime is 145989427. The reversal of 145989381 is 183989541.

145989381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 145989381 - 2³ = 145989373 is a prime.

It is a super-2 number, since 2×145989381² = 42625798729526322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145989381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145989341) 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, 96186 + ... + 97691.

It is an arithmetic number, because the mean of its divisors is an integer number (24428628).

Almost surely, 2^145989381 is an apocalyptic number.

It is an amenable number.

145989381 is a deficient number, since it is larger than the sum of its proper divisors (49439643).

145989381 is a wasteful number, since it uses less digits than its factorization.

145989381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194131.

The product of its digits is 311040, while the sum is 48.

The square root of 145989381 is about 12082.6065482577. The cubic root of 145989381 is about 526.5509763424.

The spelling of 145989381 in words is "one hundred forty-five million, nine hundred eighty-nine thousand, three hundred eighty-one".