1985658994 has 8 divisors (see below), whose sum is σ = 3249260208. Its totient is φ = 902572260.

The previous prime is 1985658979. The next prime is 1985659019. The reversal of 1985658994 is 4998565891.

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

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, 45128592 + ... + 45128635.

It is an arithmetic number, because the mean of its divisors is an integer number (406157526).

Almost surely, 2^1985658994 is an apocalyptic number.

1985658994 is a deficient number, since it is larger than the sum of its proper divisors (1263601214).

1985658994 is a wasteful number, since it uses less digits than its factorization.

1985658994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90257240.

The product of its digits is 27993600, while the sum is 64.

The square root of 1985658994 is about 44560.7337686443. The cubic root of 1985658994 is about 1256.9024007230.

The spelling of 1985658994 in words is "one billion, nine hundred eighty-five million, six hundred fifty-eight thousand, nine hundred ninety-four".