400644101 has 8 divisors (see below), whose sum is σ = 470686944. Its totient is φ = 336204720.

The previous prime is 400644067. The next prime is 400644109. The reversal of 400644101 is 101446004.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400644101 - 2⁶ = 400644037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400644109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1400711 + ... + 1400996.

It is an arithmetic number, because the mean of its divisors is an integer number (58835868).

Almost surely, 2^400644101 is an apocalyptic number.

It is an amenable number.

400644101 is a deficient number, since it is larger than the sum of its proper divisors (70042843).

400644101 is a wasteful number, since it uses less digits than its factorization.

400644101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801731.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 400644101 is about 20016.0960479310. The cubic root of 400644101 is about 737.2015690382.

The spelling of 400644101 in words is "four hundred million, six hundred forty-four thousand, one hundred one".