13439890 has 16 divisors (see below), whose sum is σ = 24465240. Its totient is φ = 5315200.

The previous prime is 13439879. The next prime is 13439891. The reversal of 13439890 is 9893431.

It can be written as a sum of positive squares in 4 ways, for example, as 5948721 + 7491169 = 2439^2 + 2737^2 .

It is not an unprimeable number, because it can be changed into a prime (13439891) 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 in 7 ways as a sum of consecutive naturals, for example, 6661 + ... + 8440.

Almost surely, 2^13439890 is an apocalyptic number.

13439890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13439890 is a deficient number, since it is larger than the sum of its proper divisors (11025350).

13439890 is a wasteful number, since it uses less digits than its factorization.

13439890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15197.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 13439890 is about 3666.0455534540. The cubic root of 13439890 is about 237.7562294665.

The spelling of 13439890 in words is "thirteen million, four hundred thirty-nine thousand, eight hundred ninety".