13780436 has 6 divisors (see below), whose sum is σ = 24115770. Its totient is φ = 6890216.

The previous prime is 13780433. The next prime is 13780439. The reversal of 13780436 is 63408731.

It is an interprime number because it is at equal distance from previous prime (13780433) and next prime (13780439).

It can be written as a sum of positive squares in only one way, i.e., 12292036 + 1488400 = 3506^2 + 1220^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13780433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1722551 + ... + 1722558.

It is an arithmetic number, because the mean of its divisors is an integer number (4019295).

Almost surely, 2^13780436 is an apocalyptic number.

It is an amenable number.

13780436 is a deficient number, since it is larger than the sum of its proper divisors (10335334).

13780436 is a wasteful number, since it uses less digits than its factorization.

13780436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3445113 (or 3445111 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 13780436 is about 3712.2009643876. The cubic root of 13780436 is about 239.7476282302.

The spelling of 13780436 in words is "thirteen million, seven hundred eighty thousand, four hundred thirty-six".