13640554 has 4 divisors (see below), whose sum is σ = 20460834. Its totient is φ = 6820276.

The previous prime is 13640551. The next prime is 13640563. The reversal of 13640554 is 45504631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45504631 = 17 ⋅2676743.

It can be written as a sum of positive squares in only one way, i.e., 12766329 + 874225 = 3573^2 + 935^2 .

It is not an unprimeable number, because it can be changed into a prime (13640551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3410137 + ... + 3410140.

Almost surely, 2^13640554 is an apocalyptic number.

13640554 is a deficient number, since it is larger than the sum of its proper divisors (6820280).

13640554 is an equidigital number, since it uses as much as digits as its factorization.

13640554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6820279.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 13640554 is about 3693.3120637173. The cubic root of 13640554 is about 238.9336603865.

The spelling of 13640554 in words is "thirteen million, six hundred forty thousand, five hundred fifty-four".