1634396243 has 16 divisors (see below), whose sum is σ = 1700721792. Its totient is φ = 1569480000.

The previous prime is 1634396177. The next prime is 1634396251. The reversal of 1634396243 is 3426934361.

It is a de Polignac number, because none of the positive numbers 2^k-1634396243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a self number, because there is not a number n which added to its sum of digits gives 1634396243.

It is not an unprimeable number, because it can be changed into a prime (1634396293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1125668 + ... + 1127118.

It is an arithmetic number, because the mean of its divisors is an integer number (106295112).

Almost surely, 2^1634396243 is an apocalyptic number.

1634396243 is a deficient number, since it is larger than the sum of its proper divisors (66325549).

1634396243 is a wasteful number, since it uses less digits than its factorization.

1634396243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1906.

The product of its digits is 279936, while the sum is 41.

The square root of 1634396243 is about 40427.6668013379. Note that the first 3 decimals coincide. The cubic root of 1634396243 is about 1177.9290119824.

The spelling of 1634396243 in words is "one billion, six hundred thirty-four million, three hundred ninety-six thousand, two hundred forty-three".