1401005644 has 24 divisors (see below), whose sum is σ = 2490546240. Its totient is φ = 689439696.

The previous prime is 1401005621. The next prime is 1401005659. The reversal of 1401005644 is 4465001041.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541947 + ... + 544525.

It is an arithmetic number, because the mean of its divisors is an integer number (103772760).

Almost surely, 2^1401005644 is an apocalyptic number.

It is an amenable number.

1401005644 is a deficient number, since it is larger than the sum of its proper divisors (1089540596).

1401005644 is a wasteful number, since it uses less digits than its factorization.

1401005644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4677 (or 4675 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1401005644 is about 37430.0099385506. The cubic root of 1401005644 is about 1118.9567357862.

Adding to 1401005644 its reverse (4465001041), we get a palindrome (5866006685).

The spelling of 1401005644 in words is "one billion, four hundred one million, five thousand, six hundred forty-four".