646154 has 4 divisors (see below), whose sum is σ = 969234. Its totient is φ = 323076.

The previous prime is 646147. The next prime is 646157. The reversal of 646154 is 451646.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 616225 + 29929 = 785^2 + 173^2 .

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646154.

It is not an unprimeable number, because it can be changed into a prime (646157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161537 + ... + 161540.

2⁶⁴⁶¹⁵⁴ is an apocalyptic number.

646154 is a deficient number, since it is larger than the sum of its proper divisors (323080).

646154 is a wasteful number, since it uses less digits than its factorization.

646154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323079.

The product of its digits is 2880, while the sum is 26.

The square root of 646154 is about 803.8370481634. The cubic root of 646154 is about 86.4527234501.

The spelling of 646154 in words is "six hundred forty-six thousand, one hundred fifty-four".