30420240 has 40 divisors (see below), whose sum is σ = 94303488. Its totient is φ = 8112000.

The previous prime is 30420239. The next prime is 30420241. The reversal of 30420240 is 4202403.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (30420239) and next prime (30420241).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (30420241) 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, 63136 + ... + 63615.

Almost surely, 2^30420240 is an apocalyptic number.

30420240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30420240 is an abundant number, since it is smaller than the sum of its proper divisors (63883248).

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

30420240 is a wasteful number, since it uses less digits than its factorization.

30420240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126767 (or 126761 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 30420240 is about 5515.4546503439. The cubic root of 30420240 is about 312.1673986632.

Adding to 30420240 its reverse (4202403), we get a palindrome (34622643).

The spelling of 30420240 in words is "thirty million, four hundred twenty thousand, two hundred forty".