654638 has 4 divisors (see below), whose sum is σ = 981960. Its totient is φ = 327318.

The previous prime is 654629. The next prime is 654671. The reversal of 654638 is 836456.

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

It is a super-2 number, since 2×654638² = 857101822088, which contains 22 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 654638.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 163658 + ... + 163661.

It is an arithmetic number, because the mean of its divisors is an integer number (245490).

2⁶⁵⁴⁶³⁸ is an apocalyptic number.

654638 is a deficient number, since it is larger than the sum of its proper divisors (327322).

654638 is a wasteful number, since it uses less digits than its factorization.

654638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327321.

The product of its digits is 17280, while the sum is 32.

The square root of 654638 is about 809.0970275560. The cubic root of 654638 is about 86.8294540686.

The spelling of 654638 in words is "six hundred fifty-four thousand, six hundred thirty-eight".