18819957 has 16 divisors (see below), whose sum is σ = 28199808. Its totient is φ = 11077440.

The previous prime is 18819953. The next prime is 18819959. The reversal of 18819957 is 75991881.

It is not a de Polignac number, because 18819957 - 2² = 18819953 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18819953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9594 + ... + 11387.

It is an arithmetic number, because the mean of its divisors is an integer number (1762488).

Almost surely, 2^18819957 is an apocalyptic number.

It is an amenable number.

18819957 is a deficient number, since it is larger than the sum of its proper divisors (9379851).

18819957 is a wasteful number, since it uses less digits than its factorization.

18819957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21020.

The product of its digits is 181440, while the sum is 48.

The square root of 18819957 is about 4338.1974367242. The cubic root of 18819957 is about 265.9946340335.

The spelling of 18819957 in words is "eighteen million, eight hundred nineteen thousand, nine hundred fifty-seven".