149978843 has 4 divisors (see below), whose sum is σ = 171404400. Its totient is φ = 128553288.

The previous prime is 149978831. The next prime is 149978849. The reversal of 149978843 is 348879941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 348879941 = 43 ⋅8113487.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149978843 is a prime.

It is a Duffinian number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10712768 + ... + 10712781.

It is an arithmetic number, because the mean of its divisors is an integer number (42851100).

Almost surely, 2^149978843 is an apocalyptic number.

149978843 is a deficient number, since it is larger than the sum of its proper divisors (21425557).

149978843 is an equidigital number, since it uses as much as digits as its factorization.

149978843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21425556.

The product of its digits is 1741824, while the sum is 53.

The square root of 149978843 is about 12246.5849525490. The cubic root of 149978843 is about 531.3043026752.

The spelling of 149978843 in words is "one hundred forty-nine million, nine hundred seventy-eight thousand, eight hundred forty-three".