400400408440 has 32 divisors (see below), whose sum is σ = 900993203280. Its totient is φ = 160143757312.

The previous prime is 400400408437. The next prime is 400400408467. The reversal of 400400408440 is 44804004004.

It is a junction number, because it is equal to n+sod(n) for n = 400400408399 and 400400408408.

It is a congruent number.

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, 113482 + ... + 902041.

Almost surely, 2^400400408440 is an apocalyptic number.

400400408440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400400408440 is an abundant number, since it is smaller than the sum of its proper divisors (500592794840).

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

400400408440 is a wasteful number, since it uses less digits than its factorization.

400400408440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025391 (or 1025387 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 28.

The spelling of 400400408440 in words is "four hundred billion, four hundred million, four hundred eight thousand, four hundred forty".