1816949953 has 16 divisors (see below), whose sum is σ = 2367792000. Its totient is φ = 1353021696.

The previous prime is 1816949947. The next prime is 1816949999. The reversal of 1816949953 is 3599496181.

It is not a de Polignac number, because 1816949953 - 2¹³ = 1816941761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1816949894 and 1816949903.

It is not an unprimeable number, because it can be changed into a prime (1816949933) 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, 585703 + ... + 588796.

It is an arithmetic number, because the mean of its divisors is an integer number (147987000).

Almost surely, 2^1816949953 is an apocalyptic number.

1816949953 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1816949953 is a deficient number, since it is larger than the sum of its proper divisors (550842047).

1816949953 is a wasteful number, since it uses less digits than its factorization.

1816949953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174536.

The product of its digits is 2099520, while the sum is 55.

The square root of 1816949953 is about 42625.6959239377. The cubic root of 1816949953 is about 1220.2467370257.

The spelling of 1816949953 in words is "one billion, eight hundred sixteen million, nine hundred forty-nine thousand, nine hundred fifty-three".