19988415 has 12 divisors (see below), whose sum is σ = 34646664. Its totient is φ = 10660464.

The previous prime is 19988411. The next prime is 19988429. The reversal of 19988415 is 51488991.

It is not a de Polignac number, because 19988415 - 2² = 19988411 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 444187 = 19988415 / (1 + 9 + 9 + 8 + 8 + 4 + 1 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19988411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222049 + ... + 222138.

It is an arithmetic number, because the mean of its divisors is an integer number (2887222).

Almost surely, 2^19988415 is an apocalyptic number.

19988415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19988415 is a deficient number, since it is larger than the sum of its proper divisors (14658249).

19988415 is a wasteful number, since it uses less digits than its factorization.

19988415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444198 (or 444195 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 19988415 is about 4470.8405250020. The cubic root of 19988415 is about 271.3893406564.

The spelling of 19988415 in words is "nineteen million, nine hundred eighty-eight thousand, four hundred fifteen".