1640274413 has 12 divisors (see below), whose sum is σ = 1684783860. Its totient is φ = 1596913920.

The previous prime is 1640274409. The next prime is 1640274473. The reversal of 1640274413 is 3144720461.

It can be written as a sum of positive squares in 6 ways, for example, as 178970884 + 1461303529 = 13378^2 + 38227^2 .

It is not a de Polignac number, because 1640274413 - 2² = 1640274409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640274413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640274473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1271873 + ... + 1273161.

It is an arithmetic number, because the mean of its divisors is an integer number (140398655).

Almost surely, 2^1640274413 is an apocalyptic number.

It is an amenable number.

1640274413 is a deficient number, since it is larger than the sum of its proper divisors (44509447).

1640274413 is an equidigital number, since it uses as much as digits as its factorization.

1640274413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2128 (or 2087 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 1640274413 is about 40500.3013939403. The cubic root of 1640274413 is about 1179.3394783169.

Adding to 1640274413 its reverse (3144720461), we get a palindrome (4784994874).

The spelling of 1640274413 in words is "one billion, six hundred forty million, two hundred seventy-four thousand, four hundred thirteen".