1401643644 has 48 divisors (see below), whose sum is σ = 3444080640. Its totient is φ = 442791360.

The previous prime is 1401643627. The next prime is 1401643651. The reversal of 1401643644 is 4463461041.

1401643644 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6789 + ... + 53379.

It is an arithmetic number, because the mean of its divisors is an integer number (71751680).

Almost surely, 2^1401643644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1401643644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1722040320).

1401643644 is an abundant number, since it is smaller than the sum of its proper divisors (2042436996).

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

1401643644 is a wasteful number, since it uses less digits than its factorization.

1401643644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46730 (or 46728 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 1401643644 is about 37438.5315417151. The cubic root of 1401643644 is about 1119.1265628581.

The spelling of 1401643644 in words is "one billion, four hundred one million, six hundred forty-three thousand, six hundred forty-four".