149478909 has 48 divisors (see below), whose sum is σ = 233062272. Its totient is φ = 84750336.

The previous prime is 149478899. The next prime is 149478911. The reversal of 149478909 is 909874941.

It is not a de Polignac number, because 149478909 - 2⁵ = 149478877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149471909) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 423277 + ... + 423629.

It is an arithmetic number, because the mean of its divisors is an integer number (4855464).

Almost surely, 2^149478909 is an apocalyptic number.

149478909 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

149478909 is a deficient number, since it is larger than the sum of its proper divisors (83583363).

149478909 is a wasteful number, since it uses less digits than its factorization.

149478909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 51.

The square root of 149478909 is about 12226.1567550887. The cubic root of 149478909 is about 530.7133020593.

The spelling of 149478909 in words is "one hundred forty-nine million, four hundred seventy-eight thousand, nine hundred nine".