400140671 has 8 divisors (see below), whose sum is σ = 467938944. Its totient is φ = 335001240.

The previous prime is 400140661. The next prime is 400140673. The reversal of 400140671 is 176041004.

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

It is a de Polignac number, because none of the positive numbers 2^k-400140671 is a prime.

It is a super-2 number, since 2×400140671² = 320225113176660482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400140673) 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, 664385 + ... + 664986.

It is an arithmetic number, because the mean of its divisors is an integer number (58492368).

Almost surely, 2^400140671 is an apocalyptic number.

400140671 is a deficient number, since it is larger than the sum of its proper divisors (67798273).

400140671 is a wasteful number, since it uses less digits than its factorization.

400140671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329421.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 400140671 is about 20003.5164658617. The cubic root of 400140671 is about 736.8926623374.

Adding to 400140671 its reverse (176041004), we get a palindrome (576181675).

The spelling of 400140671 in words is "four hundred million, one hundred forty thousand, six hundred seventy-one".