1401243012 has 72 divisors (see below), whose sum is σ = 3820241880. Its totient is φ = 430502400.

The previous prime is 1401243001. The next prime is 1401243013. The reversal of 1401243012 is 2103421041.

It can be written as a sum of positive squares in 4 ways, for example, as 178062336 + 1223180676 = 13344^2 + 34974^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1401243013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 376762 + ... + 380462.

It is an arithmetic number, because the mean of its divisors is an integer number (53058915).

Almost surely, 2^1401243012 is an apocalyptic number.

1401243012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1401243012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1910120940).

1401243012 is an abundant number, since it is smaller than the sum of its proper divisors (2418998868).

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

1401243012 is a wasteful number, since it uses less digits than its factorization.

1401243012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4533 (or 4528 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1401243012 is about 37433.1806289554. The cubic root of 1401243012 is about 1119.0199259965.

Adding to 1401243012 its reverse (2103421041), we get a palindrome (3504664053).

The spelling of 1401243012 in words is "one billion, four hundred one million, two hundred forty-three thousand, twelve".