149969778 has 32 divisors (see below), whose sum is σ = 343719936. Its totient is φ = 42732048.

The previous prime is 149969777. The next prime is 149969789. The reversal of 149969778 is 877969941.

149969778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (149969777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11425 + ... + 20747.

It is an arithmetic number, because the mean of its divisors is an integer number (10741248).

Almost surely, 2^149969778 is an apocalyptic number.

149969778 is an abundant number, since it is smaller than the sum of its proper divisors (193750158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

149969778 is a wasteful number, since it uses less digits than its factorization.

149969778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9718.

The product of its digits is 6858432, while the sum is 60.

The square root of 149969778 is about 12246.2148437793. The cubic root of 149969778 is about 531.2935981197.

The spelling of 149969778 in words is "one hundred forty-nine million, nine hundred sixty-nine thousand, seven hundred seventy-eight".