1543421440 has 160 divisors (see below), whose sum is σ = 4214301696. Its totient is φ = 536616960.

The previous prime is 1543421431. The next prime is 1543421479. The reversal of 1543421440 is 441243451.

It is a tau number, because it is divible by the number of its divisors (160).

It is a junction number, because it is equal to n+sod(n) for n = 1543421399 and 1543421408.

It is a congruent number.

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, 646489 + ... + 648871.

Almost surely, 2^1543421440 is an apocalyptic number.

1543421440 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 1543421440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2107150848).

1543421440 is an abundant number, since it is smaller than the sum of its proper divisors (2670880256).

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

1543421440 is a wasteful number, since it uses less digits than its factorization.

1543421440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440 (or 2424 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 1543421440 is about 39286.4027368249. The cubic root of 1543421440 is about 1155.6549298716.

Adding to 1543421440 its reverse (441243451), we get a palindrome (1984664891).

The spelling of 1543421440 in words is "one billion, five hundred forty-three million, four hundred twenty-one thousand, four hundred forty".