13861965 has 32 divisors (see below), whose sum is σ = 24264576. Its totient is φ = 6716160.

The previous prime is 13861943. The next prime is 13861973. The reversal of 13861965 is 56916831.

It is not a de Polignac number, because 13861965 - 2⁵ = 13861933 is a prime.

It is a super-2 number, since 2×13861965² = 384308147322450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 12535 + ... + 13595.

It is an arithmetic number, because the mean of its divisors is an integer number (758268).

Almost surely, 2^13861965 is an apocalyptic number.

13861965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13861965 is a deficient number, since it is larger than the sum of its proper divisors (10402611).

13861965 is a wasteful number, since it uses less digits than its factorization.

13861965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149.

The product of its digits is 38880, while the sum is 39.

The square root of 13861965 is about 3723.1659914648. The cubic root of 13861965 is about 240.2195040415.

The spelling of 13861965 in words is "thirteen million, eight hundred sixty-one thousand, nine hundred sixty-five".