1401263643 has 16 divisors (see below), whose sum is σ = 2076978176. Its totient is φ = 834498720.

The previous prime is 1401263627. The next prime is 1401263651. The reversal of 1401263643 is 3463621041.

It is not a de Polignac number, because 1401263643 - 2⁴ = 1401263627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1401263643.

It is not an unprimeable number, because it can be changed into a prime (1401263693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 578305 + ... + 580722.

It is an arithmetic number, because the mean of its divisors is an integer number (129811136).

Almost surely, 2^1401263643 is an apocalyptic number.

1401263643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1401263643 is a deficient number, since it is larger than the sum of its proper divisors (675714533).

1401263643 is a wasteful number, since it uses less digits than its factorization.

1401263643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159074.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 1401263643 is about 37433.4561989673. The cubic root of 1401263643 is about 1119.0254178792.

Adding to 1401263643 its reverse (3463621041), we get a palindrome (4864884684).

The spelling of 1401263643 in words is "one billion, four hundred one million, two hundred sixty-three thousand, six hundred forty-three".