19897450 has 24 divisors (see below), whose sum is σ = 37801152. Its totient is φ = 7788720.

The previous prime is 19897387. The next prime is 19897481. The reversal of 19897450 is 5479891.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 19897397 and 19897406.

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, 1884 + ... + 6583.

It is an arithmetic number, because the mean of its divisors is an integer number (1575048).

Almost surely, 2^19897450 is an apocalyptic number.

19897450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19897450 is a deficient number, since it is larger than the sum of its proper divisors (17903702).

19897450 is a wasteful number, since it uses less digits than its factorization.

19897450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8526 (or 8521 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 19897450 is about 4460.6557813846. The cubic root of 19897450 is about 270.9770272325.

The spelling of 19897450 in words is "nineteen million, eight hundred ninety-seven thousand, four hundred fifty".