1623905997 has 8 divisors (see below), whose sum is σ = 2474523456. Its totient is φ = 927946272.

The previous prime is 1623905993. The next prime is 1623906019. The reversal of 1623905997 is 7995093261.

It is a happy number.

1623905997 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1623905997 - 2² = 1623905993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623905993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38664408 + ... + 38664449.

It is an arithmetic number, because the mean of its divisors is an integer number (309315432).

Almost surely, 2^1623905997 is an apocalyptic number.

It is an amenable number.

1623905997 is a deficient number, since it is larger than the sum of its proper divisors (850617459).

1623905997 is an equidigital number, since it uses as much as digits as its factorization.

1623905997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77328867.

The product of its (nonzero) digits is 918540, while the sum is 51.

The square root of 1623905997 is about 40297.7170197022. The cubic root of 1623905997 is about 1175.4034520978.

The spelling of 1623905997 in words is "one billion, six hundred twenty-three million, nine hundred five thousand, nine hundred ninety-seven".