19940616 has 24 divisors (see below), whose sum is σ = 54006030. Its totient is φ = 6646848.

The previous prime is 19940611. The next prime is 19940621. The reversal of 19940616 is 61604991.

It is an interprime number because it is at equal distance from previous prime (19940611) and next prime (19940621).

It can be written as a sum of positive squares in only one way, i.e., 16892100 + 3048516 = 4110^2 + 1746^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (19940611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 138405 + ... + 138548.

Almost surely, 2^19940616 is an apocalyptic number.

It is an amenable number.

19940616 is an abundant number, since it is smaller than the sum of its proper divisors (34065414).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19940616 is a wasteful number, since it uses less digits than its factorization.

19940616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276965 (or 276958 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 19940616 is about 4465.4916862536. The cubic root of 19940616 is about 271.1728403637.

The spelling of 19940616 in words is "nineteen million, nine hundred forty thousand, six hundred sixteen".