40690 has 16 divisors (see below), whose sum is σ = 79128. Its totient is φ = 14976.
The previous prime is 40639. The next prime is 40693. The reversal of 40690 is 9604.
It is a happy number.
It can be written as a sum of positive squares in 4 ways, for example, as 11449 + 29241 = 107^2 + 171^2 .
It is a super-2 number, since 2×406902 = 3311352200, which contains 22 as substring.
It is not an unprimeable number, because it can be changed into a prime (40693) by changing a digit.
40690 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, 27 + ... + 286.
240690 is an apocalyptic number.
40690 is a deficient number, since it is larger than the sum of its proper divisors (38438).
40690 is a wasteful number, since it uses less digits than its factorization.
40690 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 333.
The product of its (nonzero) digits is 216, while the sum is 19.
The square root of 40690 is about 201.7176244159. The cubic root of 40690 is about 34.3950461588.
It can be divided in two parts, 406 and 90, that added together give a triangular number (496 = T31).
The spelling of 40690 in words is "forty thousand, six hundred ninety".
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