1000405646 has 4 divisors (see below), whose sum is σ = 1500608472. Its totient is φ = 500202822.

The previous prime is 1000405633. The next prime is 1000405697. The reversal of 1000405646 is 6465040001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1000405646² = 2001622913097354632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250101410 + ... + 250101413.

It is an arithmetic number, because the mean of its divisors is an integer number (375152118).

Almost surely, 2^1000405646 is an apocalyptic number.

1000405646 is a deficient number, since it is larger than the sum of its proper divisors (500202826).

1000405646 is an equidigital number, since it uses as much as digits as its factorization.

1000405646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500202825.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1000405646 is about 31629.1897777986. The cubic root of 1000405646 is about 1000.1351970543.

Adding to 1000405646 its reverse (6465040001), we get a palindrome (7465445647).

The spelling of 1000405646 in words is "one billion, four hundred five thousand, six hundred forty-six".