1381990994 has 8 divisors (see below), whose sum is σ = 2073150588. Its totient is φ = 690940800.

The previous prime is 1381990957. The next prime is 1381990999. The reversal of 1381990994 is 4990991831.

It can be written as a sum of positive squares in 2 ways, for example, as 828000625 + 553990369 = 28775^2 + 23537^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1381990999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22154 + ... + 57050.

Almost surely, 2^1381990994 is an apocalyptic number.

1381990994 is a deficient number, since it is larger than the sum of its proper divisors (691159594).

1381990994 is a wasteful number, since it uses less digits than its factorization.

1381990994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54700.

The product of its (nonzero) digits is 629856, while the sum is 53.

The square root of 1381990994 is about 37175.1394617424. The cubic root of 1381990994 is about 1113.8714459385.

The spelling of 1381990994 in words is "one billion, three hundred eighty-one million, nine hundred ninety thousand, nine hundred ninety-four".