400442973608 has 16 divisors (see below), whose sum is σ = 753541159380. Its totient is φ = 199498664448.

The previous prime is 400442973569. The next prime is 400442973611. The reversal of 400442973608 is 806379244004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 398794776004 + 1648197604 = 631502^2 + 40598^2 .

It is a super-2 number, since 2×400442973608² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90350441 + ... + 90354872.

Almost surely, 2^400442973608 is an apocalyptic number.

It is an amenable number.

400442973608 is a deficient number, since it is larger than the sum of its proper divisors (353098185772).

400442973608 is a wasteful number, since it uses less digits than its factorization.

400442973608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180705596 (or 180705592 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 47.

The spelling of 400442973608 in words is "four hundred billion, four hundred forty-two million, nine hundred seventy-three thousand, six hundred eight".