1378233640 has 64 divisors (see below), whose sum is σ = 3619468800. Its totient is φ = 462478848.

The previous prime is 1378233607. The next prime is 1378233641. The reversal of 1378233640 is 463328731.

It is a self number, because there is not a number n which added to its sum of digits gives 1378233640.

It is not an unprimeable number, because it can be changed into a prime (1378233641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39205 + ... + 65524.

It is an arithmetic number, because the mean of its divisors is an integer number (56554200).

Almost surely, 2^1378233640 is an apocalyptic number.

1378233640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1378233640 is an abundant number, since it is smaller than the sum of its proper divisors (2241235160).

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

1378233640 is a wasteful number, since it uses less digits than its factorization.

1378233640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104794 (or 104790 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 1378233640 is about 37124.5692230900. The cubic root of 1378233640 is about 1112.8610659860.

The spelling of 1378233640 in words is "one billion, three hundred seventy-eight million, two hundred thirty-three thousand, six hundred forty".