18261420 has 24 divisors (see below), whose sum is σ = 51132144. Its totient is φ = 4869696.

The previous prime is 18261409. The next prime is 18261431. The reversal of 18261420 is 2416281.

It is an interprime number because it is at equal distance from previous prime (18261409) and next prime (18261431).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152119 + ... + 152238.

It is an arithmetic number, because the mean of its divisors is an integer number (2130506).

Almost surely, 2^18261420 is an apocalyptic number.

18261420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18261420 is an abundant number, since it is smaller than the sum of its proper divisors (32870724).

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

18261420 is a wasteful number, since it uses less digits than its factorization.

18261420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304369 (or 304367 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 18261420 is about 4273.3382735281. The cubic root of 18261420 is about 263.3367764687.

It can be divided in two parts, 18261 and 420, that added together give a palindrome (18681).

The spelling of 18261420 in words is "eighteen million, two hundred sixty-one thousand, four hundred twenty".