1405544544 has 72 divisors (see below), whose sum is σ = 4006482480. Its totient is φ = 467405568.

The previous prime is 1405544533. The next prime is 1405544561. The reversal of 1405544544 is 4454455041.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1405544499 and 1405544508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120874 + ... + 131990.

It is an arithmetic number, because the mean of its divisors is an integer number (55645590).

Almost surely, 2^1405544544 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 1405544544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2003241240).

1405544544 is an abundant number, since it is smaller than the sum of its proper divisors (2600937936).

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

1405544544 is a wasteful number, since it uses less digits than its factorization.

1405544544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11572 (or 11561 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 36.

The square root of 1405544544 is about 37490.5927400461. The cubic root of 1405544544 is about 1120.1638110739.

Adding to 1405544544 its reverse (4454455041), we get a palindrome (5859999585).

The spelling of 1405544544 in words is "one billion, four hundred five million, five hundred forty-four thousand, five hundred forty-four".