18771942 has 16 divisors (see below), whose sum is σ = 42907392. Its totient is φ = 5363400.

The previous prime is 18771937. The next prime is 18771947. The reversal of 18771942 is 24917781.

It is an interprime number because it is at equal distance from previous prime (18771937) and next prime (18771947).

It is a self number, because there is not a number n which added to its sum of digits gives 18771942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18771947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223434 + ... + 223517.

It is an arithmetic number, because the mean of its divisors is an integer number (2681712).

Almost surely, 2^18771942 is an apocalyptic number.

18771942 is an abundant number, since it is smaller than the sum of its proper divisors (24135450).

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

18771942 is a wasteful number, since it uses less digits than its factorization.

18771942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446963.

The product of its digits is 28224, while the sum is 39.

The square root of 18771942 is about 4332.6599220340. The cubic root of 18771942 is about 265.7682323614.

The spelling of 18771942 in words is "eighteen million, seven hundred seventy-one thousand, nine hundred forty-two".