509654 has 4 divisors (see below), whose sum is σ = 764484. Its totient is φ = 254826.

The previous prime is 509653. The next prime is 509659. The reversal of 509654 is 456905.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 456905 = 5 ⋅91381.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127412 + ... + 127415.

It is an arithmetic number, because the mean of its divisors is an integer number (191121).

2⁵⁰⁹⁶⁵⁴ is an apocalyptic number.

509654 is a deficient number, since it is larger than the sum of its proper divisors (254830).

509654 is a wasteful number, since it uses less digits than its factorization.

509654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254829.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 509654 is about 713.9005532986. The cubic root of 509654 is about 79.8776254012.

The spelling of 509654 in words is "five hundred nine thousand, six hundred fifty-four".