400307706 has 24 divisors (see below), whose sum is σ = 897242580. Its totient is φ = 128834496.

The previous prime is 400307701. The next prime is 400307707. The reversal of 400307706 is 607703004.

It can be written as a sum of positive squares in 2 ways, for example, as 398361681 + 1946025 = 19959^2 + 1395^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 400307706.

It is not an unprimeable number, because it can be changed into a prime (400307701) 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 11 ways as a sum of consecutive naturals, for example, 382915 + ... + 383958.

Almost surely, 2^400307706 is an apocalyptic number.

400307706 is an abundant number, since it is smaller than the sum of its proper divisors (496934874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400307706 is a wasteful number, since it uses less digits than its factorization.

400307706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766910 (or 766907 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 400307706 is about 20007.6911711472. The cubic root of 400307706 is about 736.9951844016.

The spelling of 400307706 in words is "four hundred million, three hundred seven thousand, seven hundred six".