1640091229 has 24 divisors (see below), whose sum is σ = 1998927168. Its totient is φ = 1317876480.

The previous prime is 1640091223. The next prime is 1640091247. The reversal of 1640091229 is 9221900461.

It is not a de Polignac number, because 1640091229 - 2³ = 1640091221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640091194 and 1640091203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640091221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 241774 + ... + 248464.

It is an arithmetic number, because the mean of its divisors is an integer number (83288632).

Almost surely, 2^1640091229 is an apocalyptic number.

1640091229 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1640091229 is a deficient number, since it is larger than the sum of its proper divisors (358835939).

1640091229 is an equidigital number, since it uses as much as digits as its factorization.

1640091229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6833 (or 6814 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1640091229 is about 40498.0398167615. The cubic root of 1640091229 is about 1179.2955742474.

The spelling of 1640091229 in words is "one billion, six hundred forty million, ninety-one thousand, two hundred twenty-nine".