406426 has 4 divisors (see below), whose sum is σ = 609642. Its totient is φ = 203212.

The previous prime is 406423. The next prime is 406447. The reversal of 406426 is 624604.

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., 366025 + 40401 = 605^2 + 201^2 .

It is a junction number, because it is equal to n+sod(n) for n = 406397 and 406406.

It is not an unprimeable number, because it can be changed into a prime (406423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101605 + ... + 101608.

2⁴⁰⁶⁴²⁶ is an apocalyptic number.

406426 is a deficient number, since it is larger than the sum of its proper divisors (203216).

406426 is a wasteful number, since it uses less digits than its factorization.

406426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203215.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 406426 is about 637.5154900079. The cubic root of 406426 is about 74.0730955365.

The spelling of 406426 in words is "four hundred six thousand, four hundred twenty-six".