1378981240 has 256 divisors, whose sum is σ = 4077158400. Its totient is φ = 407586816.

The previous prime is 1378981211. The next prime is 1378981243. The reversal of 1378981240 is 421898731.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378981243) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8783242 + ... + 8783398.

It is an arithmetic number, because the mean of its divisors is an integer number (15926400).

Almost surely, 2^1378981240 is an apocalyptic number.

1378981240 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 1378981240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2038579200).

1378981240 is an abundant number, since it is smaller than the sum of its proper divisors (2698177160).

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

1378981240 is a wasteful number, since it uses less digits than its factorization.

1378981240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 1378981240 is about 37134.6366617475. The cubic root of 1378981240 is about 1113.0622472961.

The spelling of 1378981240 in words is "one billion, three hundred seventy-eight million, nine hundred eighty-one thousand, two hundred forty".