145439145 has 28 divisors (see below), whose sum is σ = 261677316. Its totient is φ = 77565600.

The previous prime is 145439117. The next prime is 145439153. The reversal of 145439145 is 541934541.

It is a happy number.

145439145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 24681024 + 120758121 = 4968^2 + 10989^2 .

It is not a de Polignac number, because 145439145 - 2⁵ = 145439113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 16306 + ... + 23595.

Almost surely, 2^145439145 is an apocalyptic number.

145439145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

145439145 is a deficient number, since it is larger than the sum of its proper divisors (116238171).

145439145 is an frugal number, since it uses more digits than its factorization.

145439145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39924 (or 39909 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 145439145 is about 12059.8152970931. The cubic root of 145439145 is about 525.8886175221. Note that the first 3 decimals are identical.

It can be divided in two parts, 1454391 and 45, that added together give a square (1454436 = 1206²).

The spelling of 145439145 in words is "one hundred forty-five million, four hundred thirty-nine thousand, one hundred forty-five".