1623426401 has 4 divisors (see below), whose sum is σ = 1627042500. Its totient is φ = 1619810304.

The previous prime is 1623426377. The next prime is 1623426403. The reversal of 1623426401 is 1046243261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 872611600 + 750814801 = 29540^2 + 27401^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623426401 - 2¹⁴ = 1623410017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1623426403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1807376 + ... + 1808273.

It is an arithmetic number, because the mean of its divisors is an integer number (406760625).

Almost surely, 2^1623426401 is an apocalyptic number.

It is an amenable number.

1623426401 is a deficient number, since it is larger than the sum of its proper divisors (3616099).

1623426401 is an equidigital number, since it uses as much as digits as its factorization.

1623426401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3616098.

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

The square root of 1623426401 is about 40291.7659205947. The cubic root of 1623426401 is about 1175.2877281787.

Adding to 1623426401 its reverse (1046243261), we get a palindrome (2669669662).

The spelling of 1623426401 in words is "one billion, six hundred twenty-three million, four hundred twenty-six thousand, four hundred one".