6401944 has 8 divisors (see below), whose sum is σ = 12003660. Its totient is φ = 3200968.

The previous prime is 6401939. The next prime is 6401959. The reversal of 6401944 is 4491046.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400114 + ... + 400129.

Almost surely, 2^6401944 is an apocalyptic number.

It is an amenable number.

6401944 is a deficient number, since it is larger than the sum of its proper divisors (5601716).

6401944 is a wasteful number, since it uses less digits than its factorization.

6401944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800249 (or 800245 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 6401944 is about 2530.2063156984. The cubic root of 6401944 is about 185.6823498763.

The spelling of 6401944 in words is "six million, four hundred one thousand, nine hundred forty-four".