400081641 has 8 divisors (see below), whose sum is σ = 538941984. Its totient is φ = 263971200.

The previous prime is 400081639. The next prime is 400081679. The reversal of 400081641 is 146180004.

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

It is not a de Polignac number, because 400081641 - 2¹ = 400081639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400081441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687135 + ... + 687716.

It is an arithmetic number, because the mean of its divisors is an integer number (67367748).

Almost surely, 2^400081641 is an apocalyptic number.

It is an amenable number.

400081641 is a deficient number, since it is larger than the sum of its proper divisors (138860343).

400081641 is a wasteful number, since it uses less digits than its factorization.

400081641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374951.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 400081641 is about 20002.0409208661. The cubic root of 400081641 is about 736.8564243206.

The spelling of 400081641 in words is "four hundred million, eighty-one thousand, six hundred forty-one".