1987722400 has 36 divisors (see below), whose sum is σ = 4852529262. Its totient is φ = 795088640.

The previous prime is 1987722389. The next prime is 1987722403. The reversal of 1987722400 is 42277891.

It can be written as a sum of positive squares in 3 ways, for example, as 1210204944 + 777517456 = 34788^2 + 27884^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1987722403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1241527 + ... + 1243126.

Almost surely, 2^1987722400 is an apocalyptic number.

1987722400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1987722400 is an abundant number, since it is smaller than the sum of its proper divisors (2864806862).

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

1987722400 is a wasteful number, since it uses less digits than its factorization.

1987722400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484673 (or 2484660 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 1987722400 is about 44583.8804950848. The cubic root of 1987722400 is about 1257.3376218313.

The spelling of 1987722400 in words is "one billion, nine hundred eighty-seven million, seven hundred twenty-two thousand, four hundred".