1401643646 has 8 divisors (see below), whose sum is σ = 2264193624. Its totient is φ = 646912440.

The previous prime is 1401643627. The next prime is 1401643651. The reversal of 1401643646 is 6463461041.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 26954660 + ... + 26954711.

It is an arithmetic number, because the mean of its divisors is an integer number (283024203).

Almost surely, 2^1401643646 is an apocalyptic number.

1401643646 is a deficient number, since it is larger than the sum of its proper divisors (862549978).

1401643646 is a wasteful number, since it uses less digits than its factorization.

1401643646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53909386.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 1401643646 is about 37438.5315684256. The cubic root of 1401643646 is about 1119.1265633904.

The spelling of 1401643646 in words is "one billion, four hundred one million, six hundred forty-three thousand, six hundred forty-six".