1642400503 has 2 divisors, whose sum is σ = 1642400504. Its totient is φ = 1642400502.

The previous prime is 1642400497. The next prime is 1642400519. The reversal of 1642400503 is 3050042461.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1642400503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642400533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821200251 + 821200252.

It is an arithmetic number, because the mean of its divisors is an integer number (821200252).

Almost surely, 2^1642400503 is an apocalyptic number.

1642400503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642400503 is an equidigital number, since it uses as much as digits as its factorization.

1642400503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1642400503 is about 40526.5407233334. The cubic root of 1642400503 is about 1179.8488035233.

Adding to 1642400503 its reverse (3050042461), we get a palindrome (4692442964).

The spelling of 1642400503 in words is "one billion, six hundred forty-two million, four hundred thousand, five hundred three".