4000402644 has 48 divisors (see below), whose sum is σ = 10685625216. Its totient is φ = 1141056000.

The previous prime is 4000402639. The next prime is 4000402649. The reversal of 4000402644 is 4462040004.

It is an interprime number because it is at equal distance from previous prime (4000402639) and next prime (4000402649).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000402649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10864 + ... + 90104.

It is an arithmetic number, because the mean of its divisors is an integer number (222617192).

Almost surely, 2^4000402644 is an apocalyptic number.

It is an amenable number.

4000402644 is an abundant number, since it is smaller than the sum of its proper divisors (6685222572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4000402644 is a wasteful number, since it uses less digits than its factorization.

4000402644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79856 (or 79854 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 4000402644 is about 63248.7363035816. The cubic root of 4000402644 is about 1587.4543133069.

Adding to 4000402644 its reverse (4462040004), we get a palindrome (8462442648).

The spelling of 4000402644 in words is "four billion, four hundred two thousand, six hundred forty-four".