149661978 has 8 divisors (see below), whose sum is σ = 299323968. Its totient is φ = 49887324.

The previous prime is 149661971. The next prime is 149662049. The reversal of 149661978 is 879166941.

It is a happy number.

149661978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

149661978 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 149661978.

It is not an unprimeable number, because it can be changed into a prime (149661971) 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, 12471826 + ... + 12471837.

It is an arithmetic number, because the mean of its divisors is an integer number (37415496).

Almost surely, 2^149661978 is an apocalyptic number.

149661978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

149661978 is a wasteful number, since it uses less digits than its factorization.

149661978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24943668.

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

The square root of 149661978 is about 12233.6412404484. The cubic root of 149661978 is about 530.9298711120.

The spelling of 149661978 in words is "one hundred forty-nine million, six hundred sixty-one thousand, nine hundred seventy-eight".