1978203240 has 192 divisors, whose sum is σ = 7288444800. Its totient is φ = 461293056.

The previous prime is 1978203229. The next prime is 1978203247. The reversal of 1978203240 is 423028791.

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

It is a junction number, because it is equal to n+sod(n) for n = 1978203195 and 1978203204.

It is not an unprimeable number, because it can be changed into a prime (1978203247) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 77797 + ... + 100043.

It is an arithmetic number, because the mean of its divisors is an integer number (37960650).

Almost surely, 2^1978203240 is an apocalyptic number.

1978203240 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 1978203240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3644222400).

1978203240 is an abundant number, since it is smaller than the sum of its proper divisors (5310241560).

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

1978203240 is a wasteful number, since it uses less digits than its factorization.

1978203240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22296 (or 22289 counting only the distinct ones).

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

The square root of 1978203240 is about 44476.9967511297. The cubic root of 1978203240 is about 1255.3272882795.

The spelling of 1978203240 in words is "one billion, nine hundred seventy-eight million, two hundred three thousand, two hundred forty".