1990851427 has 8 divisors (see below), whose sum is σ = 2039259456. Its totient is φ = 1942695552.

The previous prime is 1990851397. The next prime is 1990851437. The reversal of 1990851427 is 7241580991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990851427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990851437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47008 + ... + 78685.

It is an arithmetic number, because the mean of its divisors is an integer number (254907432).

Almost surely, 2^1990851427 is an apocalyptic number.

1990851427 is a deficient number, since it is larger than the sum of its proper divisors (48408029).

1990851427 is a wasteful number, since it uses less digits than its factorization.

1990851427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126077.

The product of its (nonzero) digits is 181440, while the sum is 46.

The square root of 1990851427 is about 44618.9581568194. The cubic root of 1990851427 is about 1257.9970332883.

The spelling of 1990851427 in words is "one billion, nine hundred ninety million, eight hundred fifty-one thousand, four hundred twenty-seven".