400440066 has 32 divisors (see below), whose sum is σ = 913223808. Its totient is φ = 115964160.

The previous prime is 400440043. The next prime is 400440077. The reversal of 400440066 is 660044004.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149670 + ... + 152321.

It is an arithmetic number, because the mean of its divisors is an integer number (28538244).

Almost surely, 2^400440066 is an apocalyptic number.

400440066 is an abundant number, since it is smaller than the sum of its proper divisors (512783742).

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

400440066 is a wasteful number, since it uses less digits than its factorization.

400440066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302026.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 400440066 is about 20010.9986257558. The cubic root of 400440066 is about 737.0764035336.

The spelling of 400440066 in words is "four hundred million, four hundred forty thousand, sixty-six".