400733689 has 4 divisors (see below), whose sum is σ = 408294756. Its totient is φ = 393172624.

The previous prime is 400733681. The next prime is 400733699. The reversal of 400733689 is 986337004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 161722089 + 239011600 = 12717^2 + 15460^2 .

It is a cyclic number.

It is not a de Polignac number, because 400733689 - 2³ = 400733681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400733681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3780454 + ... + 3780559.

It is an arithmetic number, because the mean of its divisors is an integer number (102073689).

Almost surely, 2^400733689 is an apocalyptic number.

It is an amenable number.

400733689 is a deficient number, since it is larger than the sum of its proper divisors (7561067).

400733689 is an equidigital number, since it uses as much as digits as its factorization.

400733689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7561066.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 400733689 is about 20018.3338217745. Note that the first 3 decimals coincide. The cubic root of 400733689 is about 737.2565134738.

The spelling of 400733689 in words is "four hundred million, seven hundred thirty-three thousand, six hundred eighty-nine".