2191038040 has 16 divisors (see below), whose sum is σ = 4929835680. Its totient is φ = 876415200.

The previous prime is 2191038023. The next prime is 2191038049. The reversal of 2191038040 is 408301912.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191038049) 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, 27387936 + ... + 27388015.

It is an arithmetic number, because the mean of its divisors is an integer number (308114730).

Almost surely, 2^2191038040 is an apocalyptic number.

2191038040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2191038040 is an abundant number, since it is smaller than the sum of its proper divisors (2738797640).

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

2191038040 is a wasteful number, since it uses less digits than its factorization.

2191038040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54775962 (or 54775958 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 2191038040 is about 46808.5252918739. The cubic root of 2191038040 is about 1298.8230057001.

Adding to 2191038040 its reverse (408301912), we get a palindrome (2599339952).

The spelling of 2191038040 in words is "two billion, one hundred ninety-one million, thirty-eight thousand, forty".