1623123644 has 6 divisors (see below), whose sum is σ = 2840466384. Its totient is φ = 811561820.

The previous prime is 1623123643. The next prime is 1623123647. The reversal of 1623123644 is 4463213261.

It is a self number, because there is not a number n which added to its sum of digits gives 1623123644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623123643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202890452 + ... + 202890459.

It is an arithmetic number, because the mean of its divisors is an integer number (473411064).

Almost surely, 2^1623123644 is an apocalyptic number.

It is an amenable number.

1623123644 is a deficient number, since it is larger than the sum of its proper divisors (1217342740).

1623123644 is a wasteful number, since it uses less digits than its factorization.

1623123644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405780915 (or 405780913 counting only the distinct ones).

The product of its digits is 20736, while the sum is 32.

The square root of 1623123644 is about 40288.0086874494. The cubic root of 1623123644 is about 1175.2146628176.

The spelling of 1623123644 in words is "one billion, six hundred twenty-three million, one hundred twenty-three thousand, six hundred forty-four".