1621262423 has 6 divisors (see below), whose sum is σ = 1782048912. Its totient is φ = 1473874820.

The previous prime is 1621262417. The next prime is 1621262471. The reversal of 1621262423 is 3242621261.

It is not a de Polignac number, because 1621262423 - 2¹⁰ = 1621261399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621262473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6699311 + ... + 6699552.

It is an arithmetic number, because the mean of its divisors is an integer number (297008152).

Almost surely, 2^1621262423 is an apocalyptic number.

1621262423 is a deficient number, since it is larger than the sum of its proper divisors (160786489).

1621262423 is a wasteful number, since it uses less digits than its factorization.

1621262423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13398885 (or 13398874 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 1621262423 is about 40264.9031167343. The cubic root of 1621262423 is about 1174.7652883832.

Adding to 1621262423 its reverse (3242621261), we get a palindrome (4863883684).

The spelling of 1621262423 in words is "one billion, six hundred twenty-one million, two hundred sixty-two thousand, four hundred twenty-three".