19697490 has 48 divisors (see below), whose sum is σ = 53913600. Its totient is φ = 4975776.

The previous prime is 19697443. The next prime is 19697533. The reversal of 19697490 is 9479691.

It is a super-2 number, since 2×19697490² = 775982224600200, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4050 + ... + 7469.

It is an arithmetic number, because the mean of its divisors is an integer number (1123200).

Almost surely, 2^19697490 is an apocalyptic number.

19697490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19697490 is an abundant number, since it is smaller than the sum of its proper divisors (34216110).

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

19697490 is a wasteful number, since it uses less digits than its factorization.

19697490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11551 (or 11548 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 19697490 is about 4438.1854400194. The cubic root of 19697490 is about 270.0662388924.

The spelling of 19697490 in words is "nineteen million, six hundred ninety-seven thousand, four hundred ninety".