403654 has 4 divisors (see below), whose sum is σ = 605484. Its totient is φ = 201826.

The previous prime is 403649. The next prime is 403661. The reversal of 403654 is 456304.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

403654 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100912 + ... + 100915.

It is an arithmetic number, because the mean of its divisors is an integer number (151371).

2⁴⁰³⁶⁵⁴ is an apocalyptic number.

403654 is a deficient number, since it is larger than the sum of its proper divisors (201830).

403654 is a wasteful number, since it uses less digits than its factorization.

403654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201829.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 403654 is about 635.3377054764. The cubic root of 403654 is about 73.9043077685.

Adding to 403654 its reverse (456304), we get a palindrome (859958).

Subtracting 403654 from its reverse (456304), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 403654 in words is "four hundred three thousand, six hundred fifty-four".