406235661 has 16 divisors (see below), whose sum is σ = 592878720. Its totient is φ = 245891520.

The previous prime is 406235657. The next prime is 406235677. The reversal of 406235661 is 166532604.

It is not a de Polignac number, because 406235661 - 2² = 406235657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406235611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83001 + ... + 87758.

It is an arithmetic number, because the mean of its divisors is an integer number (37054920).

Almost surely, 2^406235661 is an apocalyptic number.

It is an amenable number.

406235661 is a deficient number, since it is larger than the sum of its proper divisors (186643059).

406235661 is a wasteful number, since it uses less digits than its factorization.

406235661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170836.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 406235661 is about 20155.2886607957. The cubic root of 406235661 is about 740.6153033109.

The spelling of 406235661 in words is "four hundred six million, two hundred thirty-five thousand, six hundred sixty-one".