1421366144 has 64 divisors (see below), whose sum is σ = 3223428480. Its totient is φ = 617971200.

The previous prime is 1421366143. The next prime is 1421366153. The reversal of 1421366144 is 4416631241.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1421366144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421366143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10439 + ... + 54329.

It is an arithmetic number, because the mean of its divisors is an integer number (50366070).

Almost surely, 2^1421366144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421366144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1611714240).

1421366144 is an abundant number, since it is smaller than the sum of its proper divisors (1802062336).

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

1421366144 is a wasteful number, since it uses less digits than its factorization.

1421366144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43939 (or 43927 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 1421366144 is about 37701.0098538487. The cubic root of 1421366144 is about 1124.3512029257.

Adding to 1421366144 its reverse (4416631241), we get a palindrome (5837997385).

The spelling of 1421366144 in words is "one billion, four hundred twenty-one million, three hundred sixty-six thousand, one hundred forty-four".