400006634 has 16 divisors (see below), whose sum is σ = 637518600. Its totient is φ = 188233792.

The previous prime is 400006603. The next prime is 400006643. The reversal of 400006634 is 436600004.

It can be written as a sum of positive squares in 4 ways, for example, as 327501409 + 72505225 = 18097^2 + 8515^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10529 + ... + 30180.

Almost surely, 2^400006634 is an apocalyptic number.

400006634 is a deficient number, since it is larger than the sum of its proper divisors (237511966).

400006634 is an equidigital number, since it uses as much as digits as its factorization.

400006634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40762 (or 40728 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 400006634 is about 20000.1658493124. The cubic root of 400006634 is about 736.8103730164.

Adding to 400006634 its reverse (436600004), we get a palindrome (836606638).

It can be divided in two parts, 4000066 and 34, that multiplied together give a square (136002244 = 11662²).

The spelling of 400006634 in words is "four hundred million, six thousand, six hundred thirty-four".