400840694 has 16 divisors (see below), whose sum is σ = 609714000. Its totient is φ = 197622624.

The previous prime is 400840691. The next prime is 400840729. The reversal of 400840694 is 496048004.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400840691) 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 7 ways as a sum of consecutive naturals, for example, 36584 + ... + 46260.

It is an arithmetic number, because the mean of its divisors is an integer number (38107125).

Almost surely, 2^400840694 is an apocalyptic number.

400840694 is a deficient number, since it is larger than the sum of its proper divisors (208873306).

400840694 is a wasteful number, since it uses less digits than its factorization.

400840694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9967.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 400840694 is about 20021.0063183647. The cubic root of 400840694 is about 737.3221290473.

Adding to 400840694 its reverse (496048004), we get a palindrome (896888698).

The spelling of 400840694 in words is "four hundred million, eight hundred forty thousand, six hundred ninety-four".