30420540 has 36 divisors (see below), whose sum is σ = 92276184. Its totient is φ = 8112096.

The previous prime is 30420529. The next prime is 30420547. The reversal of 30420540 is 4502403.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30420547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84322 + ... + 84681.

Almost surely, 2^30420540 is an apocalyptic number.

30420540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30420540 is an abundant number, since it is smaller than the sum of its proper divisors (61855644).

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

30420540 is a wasteful number, since it uses less digits than its factorization.

30420540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169018 (or 169013 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 30420540 is about 5515.4818465842. The cubic root of 30420540 is about 312.1684248431.

Adding to 30420540 its reverse (4502403), we get a palindrome (34922943).

The spelling of 30420540 in words is "thirty million, four hundred twenty thousand, five hundred forty".