406690 has 16 divisors (see below), whose sum is σ = 744192. Its totient is φ = 159984.

The previous prime is 406673. The next prime is 406697. The reversal of 406690 is 96604.

It is a super-2 number, since 2×406690² = 330793512200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406697) by changing a digit.

406690 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 in 7 ways as a sum of consecutive naturals, for example, 367 + ... + 973.

It is an arithmetic number, because the mean of its divisors is an integer number (46512).

2⁴⁰⁶⁶⁹⁰ is an apocalyptic number.

406690 is a deficient number, since it is larger than the sum of its proper divisors (337502).

406690 is a wasteful number, since it uses less digits than its factorization.

406690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 406690 is about 637.7225101876. The cubic root of 406690 is about 74.0891304888.

It can be divided in two parts, 4066 and 90, that multiplied together give a triangular number (365940 = T₈₅₅).

The spelling of 406690 in words is "four hundred six thousand, six hundred ninety".