18941397 has 16 divisors (see below), whose sum is σ = 26492928. Its totient is φ = 12014640.

The previous prime is 18941393. The next prime is 18941407. The reversal of 18941397 is 79314981.

It is a happy number.

It is not a de Polignac number, because 18941397 - 2² = 18941393 is a prime.

It is a super-3 number, since 3×18941397³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18941393) 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, 14772 + ... + 16002.

It is an arithmetic number, because the mean of its divisors is an integer number (1655808).

Almost surely, 2^18941397 is an apocalyptic number.

It is an amenable number.

18941397 is a deficient number, since it is larger than the sum of its proper divisors (7551531).

18941397 is a wasteful number, since it uses less digits than its factorization.

18941397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480.

The product of its digits is 54432, while the sum is 42.

The square root of 18941397 is about 4352.1715269507. The cubic root of 18941397 is about 266.5655378687.

The spelling of 18941397 in words is "eighteen million, nine hundred forty-one thousand, three hundred ninety-seven".