149388909 has 4 divisors (see below), whose sum is σ = 199185216. Its totient is φ = 99592604.

The previous prime is 149388857. The next prime is 149388917. The reversal of 149388909 is 909883941.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 909883941 = 3 ⋅303294647.

It is a cyclic number.

It is not a de Polignac number, because 149388909 - 2⁷ = 149388781 is a prime.

It is a super-2 number, since 2×149388909² = 44634092264420562, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149388919) 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, 24898149 + ... + 24898154.

It is an arithmetic number, because the mean of its divisors is an integer number (49796304).

Almost surely, 2^149388909 is an apocalyptic number.

It is an amenable number.

149388909 is a deficient number, since it is larger than the sum of its proper divisors (49796307).

149388909 is an equidigital number, since it uses as much as digits as its factorization.

149388909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49796306.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 149388909 is about 12222.4755675763. The cubic root of 149388909 is about 530.6067679962.

The spelling of 149388909 in words is "one hundred forty-nine million, three hundred eighty-eight thousand, nine hundred nine".