2101780406 has 12 divisors (see below), whose sum is σ = 3465332556. Its totient is φ = 955354620.

The previous prime is 2101780393. The next prime is 2101780453. The reversal of 2101780406 is 6040871012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4342280 + ... + 4342763.

It is an arithmetic number, because the mean of its divisors is an integer number (288777713).

Almost surely, 2^2101780406 is an apocalyptic number.

2101780406 is a deficient number, since it is larger than the sum of its proper divisors (1363552150).

2101780406 is a wasteful number, since it uses less digits than its factorization.

2101780406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8685067 (or 8685056 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 2101780406 is about 45845.1786559939. The cubic root of 2101780406 is about 1280.9409597190.

The spelling of 2101780406 in words is "two billion, one hundred one million, seven hundred eighty thousand, four hundred six".