4006401643 has 16 divisors (see below), whose sum is σ = 4096806336. Its totient is φ = 3917334400.

The previous prime is 4006401601. The next prime is 4006401697. The reversal of 4006401643 is 3461046004.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4006401643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4006401143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2917305 + ... + 2918677.

It is an arithmetic number, because the mean of its divisors is an integer number (256050396).

Almost surely, 2^4006401643 is an apocalyptic number.

4006401643 is a deficient number, since it is larger than the sum of its proper divisors (90404693).

4006401643 is a wasteful number, since it uses less digits than its factorization.

4006401643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814.

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

The square root of 4006401643 is about 63296.1424022033. The cubic root of 4006401643 is about 1588.2474318462.

Adding to 4006401643 its reverse (3461046004), we get a palindrome (7467447647).

The spelling of 4006401643 in words is "four billion, six million, four hundred one thousand, six hundred forty-three".