1940556889 has 4 divisors (see below), whose sum is σ = 1943081140. Its totient is φ = 1938032640.

The previous prime is 1940556859. The next prime is 1940556923. The reversal of 1940556889 is 9886550491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9886550491 = 4297 ⋅2300803.

It can be written as a sum of positive squares in 2 ways, for example, as 480705625 + 1459851264 = 21925^2 + 38208^2 .

It is a cyclic number.

It is not a de Polignac number, because 1940556889 - 2⁹ = 1940556377 is a prime.

It is a super-2 number, since 2×1940556889² = 7531522078890716642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1940556859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1260972 + ... + 1262509.

It is an arithmetic number, because the mean of its divisors is an integer number (485770285).

Almost surely, 2^1940556889 is an apocalyptic number.

It is an amenable number.

1940556889 is a deficient number, since it is larger than the sum of its proper divisors (2524251).

1940556889 is an equidigital number, since it uses as much as digits as its factorization.

1940556889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524250.

The product of its (nonzero) digits is 3110400, while the sum is 55.

The square root of 1940556889 is about 44051.7523942011. The cubic root of 1940556889 is about 1247.3130312845.

The spelling of 1940556889 in words is "one billion, nine hundred forty million, five hundred fifty-six thousand, eight hundred eighty-nine".