18961382 has 8 divisors (see below), whose sum is σ = 31027752. Its totient is φ = 8618800.

The previous prime is 18961381. The next prime is 18961403. The reversal of 18961382 is 28316981.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18961381) 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, 430919 + ... + 430962.

It is an arithmetic number, because the mean of its divisors is an integer number (3878469).

Almost surely, 2^18961382 is an apocalyptic number.

18961382 is a deficient number, since it is larger than the sum of its proper divisors (12066370).

18961382 is a wasteful number, since it uses less digits than its factorization.

18961382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861894.

The product of its digits is 20736, while the sum is 38.

The square root of 18961382 is about 4354.4669019296. The cubic root of 18961382 is about 266.6592556968.

The spelling of 18961382 in words is "eighteen million, nine hundred sixty-one thousand, three hundred eighty-two".