149778889 has 4 divisors (see below), whose sum is σ = 161300356. Its totient is φ = 138257424.

The previous prime is 149778877. The next prime is 149778911. The reversal of 149778889 is 988877941.

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 82210489 + 67568400 = 9067^2 + 8220^2 .

It is a cyclic number.

It is not a de Polignac number, because 149778889 - 2²³ = 141390281 is a prime.

It is a super-4 number, since 4×149778889⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149778809) 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, 5760714 + ... + 5760739.

It is an arithmetic number, because the mean of its divisors is an integer number (40325089).

Almost surely, 2^149778889 is an apocalyptic number.

It is an amenable number.

149778889 is a deficient number, since it is larger than the sum of its proper divisors (11521467).

149778889 is a wasteful number, since it uses less digits than its factorization.

149778889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11521466.

The product of its digits is 8128512, while the sum is 61.

The square root of 149778889 is about 12238.4185661384. The cubic root of 149778889 is about 531.0680834295.

The spelling of 149778889 in words is "one hundred forty-nine million, seven hundred seventy-eight thousand, eight hundred eighty-nine".