149273989 has 4 divisors (see below), whose sum is σ = 152914860. Its totient is φ = 145633120.

The previous prime is 149273983. The next prime is 149274001. The reversal of 149273989 is 989372941.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21696964 + 127577025 = 4658^2 + 11295^2 .

It is a cyclic number.

It is not a de Polignac number, because 149273989 - 2³ = 149273981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149273981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1820374 + ... + 1820455.

It is an arithmetic number, because the mean of its divisors is an integer number (38228715).

Almost surely, 2^149273989 is an apocalyptic number.

It is an amenable number.

149273989 is a deficient number, since it is larger than the sum of its proper divisors (3640871).

149273989 is an equidigital number, since it uses as much as digits as its factorization.

149273989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640870.

The product of its digits is 979776, while the sum is 52.

The square root of 149273989 is about 12217.7734878332. The cubic root of 149273989 is about 530.4706736172.

The spelling of 149273989 in words is "one hundred forty-nine million, two hundred seventy-three thousand, nine hundred eighty-nine".