406040290 has 8 divisors (see below), whose sum is σ = 730872540. Its totient is φ = 162416112.

The previous prime is 406040273. The next prime is 406040309. The reversal of 406040290 is 92040604.

It can be written as a sum of positive squares in 2 ways, for example, as 396925929 + 9114361 = 19923^2 + 3019^2 .

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

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, 20302005 + ... + 20302024.

Almost surely, 2^406040290 is an apocalyptic number.

406040290 is a deficient number, since it is larger than the sum of its proper divisors (324832250).

406040290 is a wasteful number, since it uses less digits than its factorization.

406040290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40604036.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 406040290 is about 20150.4414343706. The cubic root of 406040290 is about 740.4965561824.

Adding to 406040290 its reverse (92040604), we get a palindrome (498080894).

The spelling of 406040290 in words is "four hundred six million, forty thousand, two hundred ninety".