1540331421 has 16 divisors (see below), whose sum is σ = 2098128960. Its totient is φ = 1004814720.

The previous prime is 1540331417. The next prime is 1540331431. The reversal of 1540331421 is 1241330451.

It is a happy number.

It is not a de Polignac number, because 1540331421 - 2² = 1540331417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1540331391 and 1540331400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1540331411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47481 + ... + 73041.

It is an arithmetic number, because the mean of its divisors is an integer number (131133060).

Almost surely, 2^1540331421 is an apocalyptic number.

It is an amenable number.

1540331421 is a deficient number, since it is larger than the sum of its proper divisors (557797539).

1540331421 is a wasteful number, since it uses less digits than its factorization.

1540331421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25996.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1540331421 is about 39247.0562080776. The cubic root of 1540331421 is about 1154.8831852775.

Adding to 1540331421 its reverse (1241330451), we get a palindrome (2781661872).

The spelling of 1540331421 in words is "one billion, five hundred forty million, three hundred thirty-one thousand, four hundred twenty-one".