2091438764 has 24 divisors (see below), whose sum is σ = 3811899168. Its totient is φ = 1003121280.

The previous prime is 2091438763. The next prime is 2091438779. The reversal of 2091438764 is 4678341902.

It is a super-2 number, since 2×2091438764² = 8748232207123695392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2091438761) 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, 89009 + ... + 110024.

It is an arithmetic number, because the mean of its divisors is an integer number (158829132).

Almost surely, 2^2091438764 is an apocalyptic number.

It is an amenable number.

2091438764 is a deficient number, since it is larger than the sum of its proper divisors (1720460404).

2091438764 is a wasteful number, since it uses less digits than its factorization.

2091438764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199145 (or 199143 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 2091438764 is about 45732.2508083737. The cubic root of 2091438764 is about 1278.8365820263.

The spelling of 2091438764 in words is "two billion, ninety-one million, four hundred thirty-eight thousand, seven hundred sixty-four".