145509844 has 6 divisors (see below), whose sum is σ = 254642234. Its totient is φ = 72754920.

The previous prime is 145509803. The next prime is 145509853. The reversal of 145509844 is 448905541.

It can be written as a sum of positive squares in only one way, i.e., 110250000 + 35259844 = 10500^2 + 5938^2 .

It is a super-2 number, since 2×145509844² = 42346229401808672, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 145509797 and 145509806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18188727 + ... + 18188734.

Almost surely, 2^145509844 is an apocalyptic number.

It is an amenable number.

145509844 is a deficient number, since it is larger than the sum of its proper divisors (109132390).

145509844 is a wasteful number, since it uses less digits than its factorization.

145509844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36377465 (or 36377463 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 145509844 is about 12062.7461218414. The cubic root of 145509844 is about 525.9738164474.

The spelling of 145509844 in words is "one hundred forty-five million, five hundred nine thousand, eight hundred forty-four".