18919701 has 12 divisors (see below), whose sum is σ = 27374412. Its totient is φ = 12591936.

The previous prime is 18919697. The next prime is 18919711. The reversal of 18919701 is 10791981.

It can be written as a sum of positive squares in 2 ways, for example, as 7017201 + 11902500 = 2649^2 + 3450^2 .

It is not a de Polignac number, because 18919701 - 2² = 18919697 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18919711) 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, 5425 + ... + 8201.

It is an arithmetic number, because the mean of its divisors is an integer number (2281201).

Almost surely, 2^18919701 is an apocalyptic number.

It is an amenable number.

18919701 is a deficient number, since it is larger than the sum of its proper divisors (8454711).

18919701 is a wasteful number, since it uses less digits than its factorization.

18919701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3540 (or 3537 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 36.

The square root of 18919701 is about 4349.6782639639. The cubic root of 18919701 is about 266.4637218046.

The spelling of 18919701 in words is "eighteen million, nine hundred nineteen thousand, seven hundred one".