149979893 has 4 divisors (see below), whose sum is σ = 171405600. Its totient is φ = 128554188.

The previous prime is 149979889. The next prime is 149979911. The reversal of 149979893 is 398979941.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 149979893 - 2² = 149979889 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149979493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10712843 + ... + 10712856.

It is an arithmetic number, because the mean of its divisors is an integer number (42851400).

Almost surely, 2^149979893 is an apocalyptic number.

It is an amenable number.

149979893 is a deficient number, since it is larger than the sum of its proper divisors (21425707).

149979893 is an equidigital number, since it uses as much as digits as its factorization.

149979893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21425706.

The product of its digits is 4408992, while the sum is 59.

The square root of 149979893 is about 12246.6278215679. The cubic root of 149979893 is about 531.3055425573.

The spelling of 149979893 in words is "one hundred forty-nine million, nine hundred seventy-nine thousand, eight hundred ninety-three".