1540421042 has 4 divisors (see below), whose sum is σ = 2310631566. Its totient is φ = 770210520.

The previous prime is 1540421033. The next prime is 1540421059. The reversal of 1540421042 is 2401240451.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1477710481 + 62710561 = 38441^2 + 7919^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1540420999 and 1540421017.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385105259 + ... + 385105262.

Almost surely, 2^1540421042 is an apocalyptic number.

1540421042 is a deficient number, since it is larger than the sum of its proper divisors (770210524).

1540421042 is an equidigital number, since it uses as much as digits as its factorization.

1540421042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770210523.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 1540421042 is about 39248.1979458930. The cubic root of 1540421042 is about 1154.9055830068.

Adding to 1540421042 its reverse (2401240451), we get a palindrome (3941661493).

The spelling of 1540421042 in words is "one billion, five hundred forty million, four hundred twenty-one thousand, forty-two".