145189972 has 24 divisors (see below), whose sum is σ = 257743080. Its totient is φ = 71554560.

The previous prime is 145189969. The next prime is 145189999. The reversal of 145189972 is 279981541.

It can be written as a sum of positive squares in 4 ways, for example, as 853776 + 144336196 = 924^2 + 12014^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

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 in 7 ways as a sum of consecutive naturals, for example, 219322 + ... + 219982.

It is an arithmetic number, because the mean of its divisors is an integer number (10739295).

Almost surely, 2^145189972 is an apocalyptic number.

It is an amenable number.

145189972 is a deficient number, since it is larger than the sum of its proper divisors (112553108).

145189972 is a wasteful number, since it uses less digits than its factorization.

145189972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371 (or 1369 counting only the distinct ones).

The product of its digits is 181440, while the sum is 46.

The square root of 145189972 is about 12049.4801547619. The cubic root of 145189972 is about 525.5881203650.

The spelling of 145189972 in words is "one hundred forty-five million, one hundred eighty-nine thousand, nine hundred seventy-two".