1641974400 has 576 divisors, whose sum is σ = 6570383040. Its totient is φ = 387072000.

The previous prime is 1641974371. The next prime is 1641974401. The reversal of 1641974400 is 44791461.

1641974400 is a `hidden beast` number, since 1 + 64 + 197 + 4 + 400 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1641974401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 22492764 + ... + 22492836.

It is an arithmetic number, because the mean of its divisors is an integer number (11406915).

Almost surely, 2^1641974400 is an apocalyptic number.

1641974400 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 1641974400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3285191520).

1641974400 is an abundant number, since it is smaller than the sum of its proper divisors (4928408640).

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

1641974400 is a wasteful number, since it uses less digits than its factorization.

1641974400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1641974400 is about 40521.2832965591. The cubic root of 1641974400 is about 1179.7467617058.

The spelling of 1641974400 in words is "one billion, six hundred forty-one million, nine hundred seventy-four thousand, four hundred".