405901610 has 8 divisors (see below), whose sum is σ = 730622916. Its totient is φ = 162360640.

The previous prime is 405901591. The next prime is 405901621. The reversal of 405901610 is 16109504.

It is a Cunningham number, because it is equal to 20147²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 405901609 + 1 = 20147^2 + 1^2 .

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

It is a super-2 number, since 2×405901610² = 329512234001184200, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 405901610.

It is an unprimeable number.

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, 20295071 + ... + 20295090.

Almost surely, 2^405901610 is an apocalyptic number.

405901610 is a deficient number, since it is larger than the sum of its proper divisors (324721306).

405901610 is a wasteful number, since it uses less digits than its factorization.

405901610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40590168.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 405901610 is about 20147.0000248176. Note that the first 4 decimals coincide. The cubic root of 405901610 is about 740.4122429107.

The spelling of 405901610 in words is "four hundred five million, nine hundred one thousand, six hundred ten".