1623998400 has 168 divisors, whose sum is σ = 5608807680. Its totient is φ = 410250240.

The previous prime is 1623998393. The next prime is 1623998417. The reversal of 1623998400 is 48993261.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82297 + ... + 100103.

It is an arithmetic number, because the mean of its divisors is an integer number (33385760).

Almost surely, 2^1623998400 is an apocalyptic number.

1623998400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1623998400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2804403840).

1623998400 is an abundant number, since it is smaller than the sum of its proper divisors (3984809280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1623998400 is a wasteful number, since it uses less digits than its factorization.

1623998400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17851 (or 17836 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 1623998400 is about 40298.8635075482. The cubic root of 1623998400 is about 1175.4257458236.

The spelling of 1623998400 in words is "one billion, six hundred twenty-three million, nine hundred ninety-eight thousand, four hundred".