19897470 has 24 divisors (see below), whose sum is σ = 51733656. Its totient is φ = 5305968.

The previous prime is 19897387. The next prime is 19897481. The reversal of 19897470 is 7479891.

19897470 is a `hidden beast` number, since 1 + 98 + 97 + 470 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110452 + ... + 110631.

It is an arithmetic number, because the mean of its divisors is an integer number (2155569).

Almost surely, 2^19897470 is an apocalyptic number.

19897470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19897470 is an abundant number, since it is smaller than the sum of its proper divisors (31836186).

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

19897470 is a wasteful number, since it uses less digits than its factorization.

19897470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221096 (or 221093 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 19897470 is about 4460.6580232069. The cubic root of 19897470 is about 270.9771180237.

The spelling of 19897470 in words is "nineteen million, eight hundred ninety-seven thousand, four hundred seventy".