19149897 has 24 divisors (see below), whose sum is σ = 27985824. Its totient is φ = 11641344.

The previous prime is 19149887. The next prime is 19149899. The reversal of 19149897 is 79894191.

It is not a de Polignac number, because 19149897 - 2⁶ = 19149833 is a prime.

It is a super-2 number, since 2×19149897² = 733437110221218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19149899) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54073 + ... + 54425.

It is an arithmetic number, because the mean of its divisors is an integer number (1166076).

Almost surely, 2^19149897 is an apocalyptic number.

It is an amenable number.

19149897 is a deficient number, since it is larger than the sum of its proper divisors (8835927).

19149897 is a wasteful number, since it uses less digits than its factorization.

19149897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 476 counting only the distinct ones).

The product of its digits is 163296, while the sum is 48.

The square root of 19149897 is about 4376.0595288456. The cubic root of 19149897 is about 267.5400563068.

It can be divided in two parts, 1914 and 9897, that added together give a palindrome (11811).

The spelling of 19149897 in words is "nineteen million, one hundred forty-nine thousand, eight hundred ninety-seven".