19897396 has 18 divisors (see below), whose sum is σ = 35445410. Its totient is φ = 9773232.

The previous prime is 19897387. The next prime is 19897481. The reversal of 19897396 is 69379891.

19897396 = 899² + 900² + ... + 922².

It can be written as a sum of positive squares in only one way, i.e., 12531600 + 7365796 = 3540^2 + 2714^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 13210 + ... + 14638.

Almost surely, 2^19897396 is an apocalyptic number.

It is an amenable number.

19897396 is a deficient number, since it is larger than the sum of its proper divisors (15548014).

19897396 is a wasteful number, since it uses less digits than its factorization.

19897396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551 (or 1490 counting only the distinct ones).

The product of its digits is 734832, while the sum is 52.

The square root of 19897396 is about 4460.6497284588. The cubic root of 19897396 is about 270.9767820960.

The spelling of 19897396 in words is "nineteen million, eight hundred ninety-seven thousand, three hundred ninety-six".