13909570 has 24 divisors (see below), whose sum is σ = 26602164. Its totient is φ = 5235456.

The previous prime is 13909547. The next prime is 13909573. The reversal of 13909570 is 7590931.

It can be written as a sum of positive squares in 6 ways, for example, as 11485321 + 2424249 = 3389^2 + 1557^2 .

It is a super-2 number, since 2×13909570² = 386952275169800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (13909573) 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 11 ways as a sum of consecutive naturals, for example, 484 + ... + 5296.

Almost surely, 2^13909570 is an apocalyptic number.

13909570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13909570 is a deficient number, since it is larger than the sum of its proper divisors (12692594).

13909570 is a wasteful number, since it uses less digits than its factorization.

13909570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4854 (or 4837 counting only the distinct ones).

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 13909570 is about 3729.5535925899. The cubic root of 13909570 is about 240.4941785092.

The spelling of 13909570 in words is "thirteen million, nine hundred nine thousand, five hundred seventy".