1821687942 has 8 divisors (see below), whose sum is σ = 3643375896. Its totient is φ = 607229312.

The previous prime is 1821687941. The next prime is 1821687943. The reversal of 1821687942 is 2497861281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1821687941) and next prime (1821687943).

It is a sphenic number, since it is the product of 3 distinct primes.

1821687942 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1821687891 and 1821687900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821687941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151807323 + ... + 151807334.

It is an arithmetic number, because the mean of its divisors is an integer number (455421987).

Almost surely, 2^1821687942 is an apocalyptic number.

1821687942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1821687942 is a wasteful number, since it uses less digits than its factorization.

1821687942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303614662.

The product of its digits is 387072, while the sum is 48.

The square root of 1821687942 is about 42681.2364160178. The cubic root of 1821687942 is about 1221.3064795657.

The spelling of 1821687942 in words is "one billion, eight hundred twenty-one million, six hundred eighty-seven thousand, nine hundred forty-two".