19649616 has 40 divisors (see below), whose sum is σ = 58014144. Its totient is φ = 5614080.

The previous prime is 19649611. The next prime is 19649621. The reversal of 19649616 is 61694691.

It is an interprime number because it is at equal distance from previous prime (19649611) and next prime (19649621).

It is a super-2 number, since 2×19649616² = 772214817894912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19649611) 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, 28905 + ... + 29576.

Almost surely, 2^19649616 is an apocalyptic number.

19649616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19649616 is an abundant number, since it is smaller than the sum of its proper divisors (38364528).

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

19649616 is a wasteful number, since it uses less digits than its factorization.

19649616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58499 (or 58493 counting only the distinct ones).

The product of its digits is 69984, while the sum is 42.

The square root of 19649616 is about 4432.7887384806. The cubic root of 19649616 is about 269.8472661554.

The spelling of 19649616 in words is "nineteen million, six hundred forty-nine thousand, six hundred sixteen".