1543490421 has 16 divisors (see below), whose sum is σ = 2270306880. Its totient is φ = 924936320.

The previous prime is 1543490413. The next prime is 1543490437. The reversal of 1543490421 is 1240943451.

It is not a de Polignac number, because 1543490421 - 2³ = 1543490413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1543490021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 259830 + ... + 265703.

It is an arithmetic number, because the mean of its divisors is an integer number (141894180).

Almost surely, 2^1543490421 is an apocalyptic number.

1543490421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1543490421 is a deficient number, since it is larger than the sum of its proper divisors (726816459).

1543490421 is a wasteful number, since it uses less digits than its factorization.

1543490421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525636.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 1543490421 is about 39287.2806516308. The cubic root of 1543490421 is about 1155.6721463930.

The spelling of 1543490421 in words is "one billion, five hundred forty-three million, four hundred ninety thousand, four hundred twenty-one".