406990 has 8 divisors (see below), whose sum is σ = 732600. Its totient is φ = 162792.

The previous prime is 406981. The next prime is 406993. The reversal of 406990 is 99604.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20340 + ... + 20359.

It is an arithmetic number, because the mean of its divisors is an integer number (91575).

2⁴⁰⁶⁹⁹⁰ is an apocalyptic number.

406990 is a deficient number, since it is larger than the sum of its proper divisors (325610).

406990 is a wasteful number, since it uses less digits than its factorization.

406990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40706.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 406990 is about 637.9576788471. The cubic root of 406990 is about 74.1073436045.

The spelling of 406990 in words is "four hundred six thousand, nine hundred ninety".