149971778 has 16 divisors (see below), whose sum is σ = 247060800. Its totient is φ = 67710000.

The previous prime is 149971777. The next prime is 149971781. The reversal of 149971778 is 877179941.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (149971777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19598 + ... + 26153.

It is an arithmetic number, because the mean of its divisors is an integer number (15441300).

Almost surely, 2^149971778 is an apocalyptic number.

149971778 is a deficient number, since it is larger than the sum of its proper divisors (97089022).

149971778 is a wasteful number, since it uses less digits than its factorization.

149971778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45913.

The product of its digits is 889056, while the sum is 53.

The square root of 149971778 is about 12246.2965013918. The cubic root of 149971778 is about 531.2959598900.

The spelling of 149971778 in words is "one hundred forty-nine million, nine hundred seventy-one thousand, seven hundred seventy-eight".