145172409 has 8 divisors (see below), whose sum is σ = 193628352. Its totient is φ = 96749040.

The previous prime is 145172393. The next prime is 145172453. The reversal of 145172409 is 904271541.

It is a happy number.

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

It is not a de Polignac number, because 145172409 - 2⁴ = 145172393 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 145172409.

It is not an unprimeable number, because it can be changed into a prime (145174409) 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, 5547 + ... + 17919.

It is an arithmetic number, because the mean of its divisors is an integer number (24203544).

Almost surely, 2^145172409 is an apocalyptic number.

It is an amenable number.

145172409 is a deficient number, since it is larger than the sum of its proper divisors (48455943).

145172409 is a wasteful number, since it uses less digits than its factorization.

145172409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16287.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 145172409 is about 12048.7513460939. The cubic root of 145172409 is about 525.5669268067.

The spelling of 145172409 in words is "one hundred forty-five million, one hundred seventy-two thousand, four hundred nine".