406821707 has 8 divisors (see below), whose sum is σ = 415911936. Its totient is φ = 397749672.

The previous prime is 406821689. The next prime is 406821731. The reversal of 406821707 is 707128604.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 406821707 - 2¹⁸ = 406559563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406824707) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 47108 + ... + 55070.

It is an arithmetic number, because the mean of its divisors is an integer number (51988992).

Almost surely, 2^406821707 is an apocalyptic number.

406821707 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

406821707 is a deficient number, since it is larger than the sum of its proper divisors (9090229).

406821707 is a wasteful number, since it uses less digits than its factorization.

406821707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9097.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 406821707 is about 20169.8216898415. The cubic root of 406821707 is about 740.9712757413.

The spelling of 406821707 in words is "four hundred six million, eight hundred twenty-one thousand, seven hundred seven".