1540403421403 has 32 divisors (see below), whose sum is σ = 1930054275072. Its totient is φ = 1194350054400.

The previous prime is 1540403421367. The next prime is 1540403421413. The reversal of 1540403421403 is 3041243040451.

It is a cyclic number.

It is not a de Polignac number, because 1540403421403 - 2³³ = 1531813486811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1540403421413) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37085775 + ... + 37127287.

It is an arithmetic number, because the mean of its divisors is an integer number (60314196096).

Almost surely, 2^{1540403421403} is an apocalyptic number.

1540403421403 is a deficient number, since it is larger than the sum of its proper divisors (389650853669).

1540403421403 is a wasteful number, since it uses less digits than its factorization.

1540403421403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43915.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 1540403421403 its reverse (3041243040451), we get a palindrome (4581646461854).

The spelling of 1540403421403 in words is "one trillion, five hundred forty billion, four hundred three million, four hundred twenty-one thousand, four hundred three".