13640490 has 24 divisors (see below), whose sum is σ = 35465508. Its totient is φ = 3637440.

The previous prime is 13640489. The next prime is 13640491. The reversal of 13640490 is 9404631.

13640490 is a `hidden beast` number, since 13 + 640 + 4 + 9 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (13640489) and next prime (13640491).

It can be written as a sum of positive squares in 2 ways, for example, as 13461561 + 178929 = 3669^2 + 423^2 .

It is not an unprimeable number, because it can be changed into a prime (13640491) 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, 75691 + ... + 75870.

Almost surely, 2^13640490 is an apocalyptic number.

13640490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13640490 is an abundant number, since it is smaller than the sum of its proper divisors (21825018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13640490 is a wasteful number, since it uses less digits than its factorization.

13640490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151574 (or 151571 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 13640490 is about 3693.3033993973. The cubic root of 13640490 is about 238.9332867023.

The spelling of 13640490 in words is "thirteen million, six hundred forty thousand, four hundred ninety".