400842408 has 32 divisors (see below), whose sum is σ = 1036663200. Its totient is φ = 129006528.

The previous prime is 400842391. The next prime is 400842433. The reversal of 400842408 is 804248004.

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, 287266 + ... + 288657.

It is an arithmetic number, because the mean of its divisors is an integer number (32395725).

Almost surely, 2^400842408 is an apocalyptic number.

It is an amenable number.

400842408 is an abundant number, since it is smaller than the sum of its proper divisors (635820792).

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

400842408 is a wasteful number, since it uses less digits than its factorization.

400842408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575961 (or 575957 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

The square root of 400842408 is about 20021.0491233601. The cubic root of 400842408 is about 737.3231799788.

The spelling of 400842408 in words is "four hundred million, eight hundred forty-two thousand, four hundred eight".