18890770 has 8 divisors (see below), whose sum is σ = 34003404. Its totient is φ = 7556304.

The previous prime is 18890761. The next prime is 18890771. The reversal of 18890770 is 7709881.

It can be written as a sum of positive squares in 2 ways, for example, as 18139081 + 751689 = 4259^2 + 867^2 .

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

It is a super-2 number, since 2×18890770² = 713722382385800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18890771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 944529 + ... + 944548.

Almost surely, 2^18890770 is an apocalyptic number.

18890770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18890770 is a deficient number, since it is larger than the sum of its proper divisors (15112634).

18890770 is a wasteful number, since it uses less digits than its factorization.

18890770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1889084.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 18890770 is about 4346.3513433684. The cubic root of 18890770 is about 266.3278318011.

The spelling of 18890770 in words is "eighteen million, eight hundred ninety thousand, seven hundred seventy".