149889817 has 8 divisors (see below), whose sum is σ = 186875712. Its totient is φ = 116797200.

The previous prime is 149889797. The next prime is 149889821. The reversal of 149889817 is 718988941.

149889817 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.

It is a cyclic number.

It is not a de Polignac number, because 149889817 - 2¹⁹ = 149365529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149889877) 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, 973234 + ... + 973387.

It is an arithmetic number, because the mean of its divisors is an integer number (23359464).

Almost surely, 2^149889817 is an apocalyptic number.

It is an amenable number.

149889817 is a deficient number, since it is larger than the sum of its proper divisors (36985895).

149889817 is a wasteful number, since it uses less digits than its factorization.

149889817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946639.

The product of its digits is 1161216, while the sum is 55.

The square root of 149889817 is about 12242.9496854312. The cubic root of 149889817 is about 531.1991561583.

The spelling of 149889817 in words is "one hundred forty-nine million, eight hundred eighty-nine thousand, eight hundred seventeen".