149978844 has 24 divisors (see below), whose sum is σ = 388834320. Its totient is φ = 49992912.

The previous prime is 149978831. The next prime is 149978849. The reversal of 149978844 is 448879941.

149978844 is a `hidden beast` number, since 1 + 499 + 78 + 84 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149978849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 694239 + ... + 694454.

It is an arithmetic number, because the mean of its divisors is an integer number (16201430).

Almost surely, 2^149978844 is an apocalyptic number.

It is an amenable number.

149978844 is an abundant number, since it is smaller than the sum of its proper divisors (238855476).

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

149978844 is a wasteful number, since it uses less digits than its factorization.

149978844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388706 (or 1388698 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 149978844 is about 12246.5849933767. The cubic root of 149978844 is about 531.3043038561.

The spelling of 149978844 in words is "one hundred forty-nine million, nine hundred seventy-eight thousand, eight hundred forty-four".