440166638 has 4 divisors (see below), whose sum is σ = 660249960. Its totient is φ = 220083318.

The previous prime is 440166637. The next prime is 440166641. The reversal of 440166638 is 836661044.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440166637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110041658 + ... + 110041661.

It is an arithmetic number, because the mean of its divisors is an integer number (165062490).

Almost surely, 2^440166638 is an apocalyptic number.

440166638 is a deficient number, since it is larger than the sum of its proper divisors (220083322).

440166638 is a wasteful number, since it uses less digits than its factorization.

440166638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220083321.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 440166638 is about 20980.1486648689. The cubic root of 440166638 is about 760.6864976686.

The spelling of 440166638 in words is "four hundred forty million, one hundred sixty-six thousand, six hundred thirty-eight".