400640461 has 8 divisors (see below), whose sum is σ = 432069120. Its totient is φ = 369298992.

The previous prime is 400640453. The next prime is 400640467. The reversal of 400640461 is 164046004.

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 400640461 - 2³ = 400640453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400640467) 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, 12085 + ... + 30778.

It is an arithmetic number, because the mean of its divisors is an integer number (54008640).

Almost surely, 2^400640461 is an apocalyptic number.

It is an amenable number.

400640461 is a deficient number, since it is larger than the sum of its proper divisors (31428659).

400640461 is a wasteful number, since it uses less digits than its factorization.

400640461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43595.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 400640461 is about 20016.0051209026. The cubic root of 400640461 is about 737.1993364484.

Adding to 400640461 its reverse (164046004), we get a palindrome (564686465).

The spelling of 400640461 in words is "four hundred million, six hundred forty thousand, four hundred sixty-one".