2152781400 has 384 divisors, whose sum is σ = 8813007360. Its totient is φ = 420864000.

The previous prime is 2152781387. The next prime is 2152781459. The reversal of 2152781400 is 41872512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 784030 + ... + 786770.

It is an arithmetic number, because the mean of its divisors is an integer number (22950540).

Almost surely, 2^2152781400 is an apocalyptic number.

2152781400 is a gapful number since it is divisible by the number (20) 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 2152781400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4406503680).

2152781400 is an abundant number, since it is smaller than the sum of its proper divisors (6660225960).

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

2152781400 is a wasteful number, since it uses less digits than its factorization.

2152781400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2795 (or 2786 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 2152781400 is about 46398.0753911194. The cubic root of 2152781400 is about 1291.2192066920.

The spelling of 2152781400 in words is "two billion, one hundred fifty-two million, seven hundred eighty-one thousand, four hundred".