2640357 has 20 divisors (see below), whose sum is σ = 4055436. Its totient is φ = 1710720.

The previous prime is 2640349. The next prime is 2640361. The reversal of 2640357 is 7530462.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1454436 + 1185921 = 1206^2 + 1089^2 .

It is not a de Polignac number, because 2640357 - 2³ = 2640349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 2³ + 6⁸ + 4² + 0 + 3¹⁰ + 5⁷ + 7⁷ .

It is a self number, because there is not a number n which added to its sum of digits gives 2640357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640317) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2557 + ... + 3437.

2^2640357 is an apocalyptic number.

2640357 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2640357 is a deficient number, since it is larger than the sum of its proper divisors (1415079).

2640357 is an equidigital number, since it uses as much as digits as its factorization.

2640357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930 (or 921 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 2640357 is about 1624.9175363692. The cubic root of 2640357 is about 138.2146941707.

The spelling of 2640357 in words is "two million, six hundred forty thousand, three hundred fifty-seven".