400039834 has 8 divisors (see below), whose sum is σ = 606246228. Its totient is φ = 197957760.

The previous prime is 400039811. The next prime is 400039847. The reversal of 400039834 is 438930004.

It can be written as a sum of positive squares in 2 ways, for example, as 370370025 + 29669809 = 19245^2 + 5447^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 400039796 and 400039805.

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 in 3 ways as a sum of consecutive naturals, for example, 1030837 + ... + 1031224.

Almost surely, 2^400039834 is an apocalyptic number.

400039834 is a deficient number, since it is larger than the sum of its proper divisors (206206394).

400039834 is a wasteful number, since it uses less digits than its factorization.

400039834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2062160.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 400039834 is about 20000.9958252083. The cubic root of 400039834 is about 736.8307572013.

Adding to 400039834 its reverse (438930004), we get a palindrome (838969838).

It can be divided in two parts, 4000 and 39834, that added together give a palindrome (43834).

The spelling of 400039834 in words is "four hundred million, thirty-nine thousand, eight hundred thirty-four".