1378742400 has 432 divisors, whose sum is σ = 5728737690. Its totient is φ = 314818560.

The previous prime is 1378742377. The next prime is 1378742413. The reversal of 1378742400 is 42478731.

It is a happy number.

1378742400 is a `hidden beast` number, since 137 + 87 + 42 + 400 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 1280494656 + 98247744 = 35784^2 + 9912^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1410712 + ... + 1411688.

Almost surely, 2^1378742400 is an apocalyptic number.

1378742400 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 1378742400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2864368845).

1378742400 is an abundant number, since it is smaller than the sum of its proper divisors (4349995290).

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

1378742400 is a wasteful number, since it uses less digits than its factorization.

1378742400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021 (or 994 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 1378742400 is about 37131.4206569046. The cubic root of 1378742400 is about 1112.9979826711.

The spelling of 1378742400 in words is "one billion, three hundred seventy-eight million, seven hundred forty-two thousand, four hundred".