1638297955 has 8 divisors (see below), whose sum is σ = 2246808672. Its totient is φ = 1123404288.

The previous prime is 1638297953. The next prime is 1638297989. The reversal of 1638297955 is 5597928361.

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

It is a cyclic number.

It is not a de Polignac number, because 1638297955 - 2¹ = 1638297953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1638297896 and 1638297905.

It is not an unprimeable number, because it can be changed into a prime (1638297953) 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, 23404222 + ... + 23404291.

It is an arithmetic number, because the mean of its divisors is an integer number (280851084).

Almost surely, 2^1638297955 is an apocalyptic number.

1638297955 is a deficient number, since it is larger than the sum of its proper divisors (608510717).

1638297955 is an equidigital number, since it uses as much as digits as its factorization.

1638297955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46808525.

The product of its digits is 4082400, while the sum is 55.

The square root of 1638297955 is about 40475.8935046529. The cubic root of 1638297955 is about 1178.8656039920.

The spelling of 1638297955 in words is "one billion, six hundred thirty-eight million, two hundred ninety-seven thousand, nine hundred fifty-five".