1940639378 has 8 divisors (see below), whose sum is σ = 2920320000. Its totient is φ = 967199380.

The previous prime is 1940639341. The next prime is 1940639399. The reversal of 1940639378 is 8739360491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1559378 + ... + 1560621.

It is an arithmetic number, because the mean of its divisors is an integer number (365040000).

Almost surely, 2^1940639378 is an apocalyptic number.

1940639378 is a deficient number, since it is larger than the sum of its proper divisors (979680622).

1940639378 is a wasteful number, since it uses less digits than its factorization.

1940639378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120312.

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 1940639378 is about 44052.6886580150. The cubic root of 1940639378 is about 1247.3307045870.

The spelling of 1940639378 in words is "one billion, nine hundred forty million, six hundred thirty-nine thousand, three hundred seventy-eight".