149657 has 4 divisors (see below), whose sum is σ = 151140. Its totient is φ = 148176.

The previous prime is 149629. The next prime is 149689. The reversal of 149657 is 756941.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 756941 = 19 ⋅39839.

It can be written as a sum of positive squares in 2 ways, for example, as 132496 + 17161 = 364^2 + 131^2 .

It is a cyclic number.

It is not a de Polignac number, because 149657 - 2¹⁰ = 148633 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (149627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578 + ... + 795.

It is an arithmetic number, because the mean of its divisors is an integer number (37785).

2¹⁴⁹⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

149657 is a deficient number, since it is larger than the sum of its proper divisors (1483).

149657 is a wasteful number, since it uses less digits than its factorization.

149657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482.

The product of its digits is 7560, while the sum is 32.

The square root of 149657 is about 386.8552700946. The cubic root of 149657 is about 53.0923984517.

The spelling of 149657 in words is "one hundred forty-nine thousand, six hundred fifty-seven".