19413978 has 16 divisors (see below), whose sum is σ = 40516416. Its totient is φ = 6189920.

The previous prime is 19413971. The next prime is 19413997. The reversal of 19413978 is 87931491.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19413971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70203 + ... + 70478.

It is an arithmetic number, because the mean of its divisors is an integer number (2532276).

Almost surely, 2^19413978 is an apocalyptic number.

19413978 is an abundant number, since it is smaller than the sum of its proper divisors (21102438).

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

19413978 is a wasteful number, since it uses less digits than its factorization.

19413978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140709.

The product of its digits is 54432, while the sum is 42.

The square root of 19413978 is about 4406.1295940996. The cubic root of 19413978 is about 268.7642568244.

The spelling of 19413978 in words is "nineteen million, four hundred thirteen thousand, nine hundred seventy-eight".