149993857 has 4 divisors (see below), whose sum is σ = 161531860. Its totient is φ = 138455856.

The previous prime is 149993849. The next prime is 149993891. The reversal of 149993857 is 758399941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 758399941 = 13 ⋅58338457.

It can be written as a sum of positive squares in 2 ways, for example, as 52359696 + 97634161 = 7236^2 + 9881^2 .

It is a cyclic number.

It is not a de Polignac number, because 149993857 - 2³ = 149993849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 149993798 and 149993807.

It is not an unprimeable number, because it can be changed into a prime (149993807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5768982 + ... + 5769007.

It is an arithmetic number, because the mean of its divisors is an integer number (40382965).

Almost surely, 2^149993857 is an apocalyptic number.

It is an amenable number.

149993857 is a deficient number, since it is larger than the sum of its proper divisors (11538003).

149993857 is a wasteful number, since it uses less digits than its factorization.

149993857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11538002.

The product of its digits is 2449440, while the sum is 55.

The square root of 149993857 is about 12247.1979244234. The cubic root of 149993857 is about 531.3220312572.

The spelling of 149993857 in words is "one hundred forty-nine million, nine hundred ninety-three thousand, eight hundred fifty-seven".