13919816 has 8 divisors (see below), whose sum is σ = 26099670. Its totient is φ = 6959904.

The previous prime is 13919813. The next prime is 13919819. The reversal of 13919816 is 61891931.

It is an interprime number because it is at equal distance from previous prime (13919813) and next prime (13919819).

It can be written as a sum of positive squares in only one way, i.e., 11874916 + 2044900 = 3446^2 + 1430^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×13919816² = 387522554947712, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13919816.

It is not an unprimeable number, because it can be changed into a prime (13919813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 869981 + ... + 869996.

Almost surely, 2^13919816 is an apocalyptic number.

It is an amenable number.

13919816 is a deficient number, since it is larger than the sum of its proper divisors (12179854).

13919816 is a wasteful number, since it uses less digits than its factorization.

13919816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739983 (or 1739979 counting only the distinct ones).

The product of its digits is 11664, while the sum is 38.

The square root of 13919816 is about 3730.9269625657. The cubic root of 13919816 is about 240.5532145678.

The spelling of 13919816 in words is "thirteen million, nine hundred nineteen thousand, eight hundred sixteen".