18941390 has 16 divisors (see below), whose sum is σ = 36717408. Its totient is φ = 6993696.

The previous prime is 18941387. The next prime is 18941393. The reversal of 18941390 is 9314981.

It is an interprime number because it is at equal distance from previous prime (18941387) and next prime (18941393).

It is a self number, because there is not a number n which added to its sum of digits gives 18941390.

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 7 ways as a sum of consecutive naturals, for example, 72722 + ... + 72981.

It is an arithmetic number, because the mean of its divisors is an integer number (2294838).

Almost surely, 2^18941390 is an apocalyptic number.

18941390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18941390 is a deficient number, since it is larger than the sum of its proper divisors (17776018).

18941390 is a wasteful number, since it uses less digits than its factorization.

18941390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145723.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 18941390 is about 4352.1707227543. The cubic root of 18941390 is about 266.5655050313.

The spelling of 18941390 in words is "eighteen million, nine hundred forty-one thousand, three hundred ninety".