401940643 has 12 divisors (see below), whose sum is σ = 440144280. Its totient is φ = 366839616.

The previous prime is 401940631. The next prime is 401940647. The reversal of 401940643 is 346049104.

It is a de Polignac number, because none of the positive numbers 2^k-401940643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401940647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1680 + ... + 28402.

It is an arithmetic number, because the mean of its divisors is an integer number (36678690).

Almost surely, 2^401940643 is an apocalyptic number.

401940643 is a deficient number, since it is larger than the sum of its proper divisors (38203637).

401940643 is a wasteful number, since it uses less digits than its factorization.

401940643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26838 (or 26825 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 401940643 is about 20048.4573720773. The cubic root of 401940643 is about 737.9959428933.

Adding to 401940643 its reverse (346049104), we get a palindrome (747989747).

The spelling of 401940643 in words is "four hundred one million, nine hundred forty thousand, six hundred forty-three".