40406 has 8 divisors (see below), whose sum is σ = 61560. Its totient is φ = 19888.

The previous prime is 40387. The next prime is 40423. The reversal of 40406 is 60404.

40406 = 99² + 100² + ... + 102².

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65 + ... + 291.

It is an arithmetic number, because the mean of its divisors is an integer number (7695).

2⁴⁰⁴⁰⁶ is an apocalyptic number.

40406 is a deficient number, since it is larger than the sum of its proper divisors (21154).

40406 is a wasteful number, since it uses less digits than its factorization.

40406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 40406 is about 201.0124374261. The cubic root of 40406 is about 34.3148380186.

The spelling of 40406 in words is "forty thousand, four hundred six".