19972078 has 16 divisors (see below), whose sum is σ = 36040320. Its totient is φ = 8108856.

The previous prime is 19972067. The next prime is 19972079. The reversal of 19972078 is 87027991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19972079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37276 + ... + 37807.

It is an arithmetic number, because the mean of its divisors is an integer number (2252520).

Almost surely, 2^19972078 is an apocalyptic number.

19972078 is a deficient number, since it is larger than the sum of its proper divisors (16068242).

19972078 is a wasteful number, since it uses less digits than its factorization.

19972078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75111.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 19972078 is about 4469.0130901576. The cubic root of 19972078 is about 271.3153828809.

The spelling of 19972078 in words is "nineteen million, nine hundred seventy-two thousand, seventy-eight".