1634861994 has 8 divisors (see below), whose sum is σ = 3269724000. Its totient is φ = 544953996.

The previous prime is 1634861993. The next prime is 1634861999. The reversal of 1634861994 is 4991684361.

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

1634861994 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1634861993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136238494 + ... + 136238505.

It is an arithmetic number, because the mean of its divisors is an integer number (408715500).

Almost surely, 2^1634861994 is an apocalyptic number.

1634861994 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1634861994 is a wasteful number, since it uses less digits than its factorization.

1634861994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272477004.

The product of its digits is 1119744, while the sum is 51.

The square root of 1634861994 is about 40433.4266912910. The cubic root of 1634861994 is about 1178.0408921365.

The spelling of 1634861994 in words is "one billion, six hundred thirty-four million, eight hundred sixty-one thousand, nine hundred ninety-four".