1640400227 has 16 divisors (see below), whose sum is σ = 1842149952. Its totient is φ = 1452549120.

The previous prime is 1640400221. The next prime is 1640400241. The reversal of 1640400227 is 7220040461.

It is a cyclic number.

It is not a de Polignac number, because 1640400227 - 2⁴ = 1640400211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1640400196 and 1640400205.

It is not an unprimeable number, because it can be changed into a prime (1640400221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10538 + ... + 58239.

It is an arithmetic number, because the mean of its divisors is an integer number (115134372).

Almost surely, 2^1640400227 is an apocalyptic number.

1640400227 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1640400227 is a deficient number, since it is larger than the sum of its proper divisors (201749725).

1640400227 is a wasteful number, since it uses less digits than its factorization.

1640400227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68878.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 1640400227 is about 40501.8546118570. The cubic root of 1640400227 is about 1179.3696305123.

Adding to 1640400227 its reverse (7220040461), we get a palindrome (8860440688).

The spelling of 1640400227 in words is "one billion, six hundred forty million, four hundred thousand, two hundred twenty-seven".