149387809 has 4 divisors (see below), whose sum is σ = 149607216. Its totient is φ = 149168404.

The previous prime is 149387803. The next prime is 149387813. The reversal of 149387809 is 908783941.

It is a happy number.

149387809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 149387809 - 2⁹ = 149387297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149387803) 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, 108679 + ... + 110044.

It is an arithmetic number, because the mean of its divisors is an integer number (37401804).

Almost surely, 2^149387809 is an apocalyptic number.

It is an amenable number.

149387809 is a deficient number, since it is larger than the sum of its proper divisors (219407).

149387809 is an equidigital number, since it uses as much as digits as its factorization.

149387809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219406.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 149387809 is about 12222.4305684262. The cubic root of 149387809 is about 530.6054656486.

The spelling of 149387809 in words is "one hundred forty-nine million, three hundred eighty-seven thousand, eight hundred nine".