149983906 has 4 divisors (see below), whose sum is σ = 224975862. Its totient is φ = 74991952.

The previous prime is 149983861. The next prime is 149983927. The reversal of 149983906 is 609389941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 609389941 = 587 ⋅1038143.

It can be written as a sum of positive squares in only one way, i.e., 123409881 + 26574025 = 11109^2 + 5155^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 149983906.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 37495975 + ... + 37495978.

Almost surely, 2^149983906 is an apocalyptic number.

149983906 is a deficient number, since it is larger than the sum of its proper divisors (74991956).

149983906 is an equidigital number, since it uses as much as digits as its factorization.

149983906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74991955.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 149983906 is about 12246.7916614924. The cubic root of 149983906 is about 531.3102812150.

The spelling of 149983906 in words is "one hundred forty-nine million, nine hundred eighty-three thousand, nine hundred six".