1401423140 has 48 divisors (see below), whose sum is σ = 3175390512. Its totient is φ = 516466176.

The previous prime is 1401423139. The next prime is 1401423157. The reversal of 1401423140 is 413241041.

It can be written as a sum of positive squares in 8 ways, for example, as 227949604 + 1173473536 = 15098^2 + 34256^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139982 + ... + 149658.

It is an arithmetic number, because the mean of its divisors is an integer number (66153969).

Almost surely, 2^1401423140 is an apocalyptic number.

1401423140 is a gapful number since it is divisible by the number (10) 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 1401423140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1587695256).

1401423140 is an abundant number, since it is smaller than the sum of its proper divisors (1773967372).

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

1401423140 is a wasteful number, since it uses less digits than its factorization.

1401423140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10256 (or 10254 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1401423140 is about 37435.5865454249. The cubic root of 1401423140 is about 1119.0678734696.

Adding to 1401423140 its reverse (413241041), we get a palindrome (1814664181).

The spelling of 1401423140 in words is "one billion, four hundred one million, four hundred twenty-three thousand, one hundred forty".