1000019997 has 12 divisors (see below), whose sum is σ = 1478066304. Its totient is φ = 651175560.

The previous prime is 1000019981. The next prime is 1000020001. The reversal of 1000019997 is 7999100001.

It is not a de Polignac number, because 1000019997 - 2⁴ = 1000019981 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000019927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1291629 + ... + 1292402.

It is an arithmetic number, because the mean of its divisors is an integer number (123172192).

Almost surely, 2^1000019997 is an apocalyptic number.

It is an amenable number.

1000019997 is a deficient number, since it is larger than the sum of its proper divisors (478046307).

1000019997 is a wasteful number, since it uses less digits than its factorization.

1000019997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2584080 (or 2584077 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 36.

The square root of 1000019997 is about 31623.0927804350. The cubic root of 1000019997 is about 1000.0066656222.

Adding to 1000019997 its reverse (7999100001), we get a palindrome (8999119998).

The spelling of 1000019997 in words is "one billion, nineteen thousand, nine hundred ninety-seven".