400364641 has 4 divisors (see below), whose sum is σ = 400406292. Its totient is φ = 400322992.

The previous prime is 400364621. The next prime is 400364663. The reversal of 400364641 is 146463004.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 372644416 + 27720225 = 19304^2 + 5265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400364641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400364621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1755 + ... + 28351.

It is an arithmetic number, because the mean of its divisors is an integer number (100101573).

Almost surely, 2^400364641 is an apocalyptic number.

It is an amenable number.

400364641 is a deficient number, since it is larger than the sum of its proper divisors (41651).

400364641 is a wasteful number, since it uses less digits than its factorization.

400364641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41650.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 400364641 is about 20009.1139483986. The cubic root of 400364641 is about 737.0301232174.

It can be divided in two parts, 4003 and 64641, that added together give a square (68644 = 262²).

The spelling of 400364641 in words is "four hundred million, three hundred sixty-four thousand, six hundred forty-one".