30143440 has 20 divisors (see below), whose sum is σ = 70083684. Its totient is φ = 12057344.

The previous prime is 30143437. The next prime is 30143447. The reversal of 30143440 is 4434103.

It can be written as a sum of positive squares in 2 ways, for example, as 22810176 + 7333264 = 4776^2 + 2708^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30143447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188317 + ... + 188476.

Almost surely, 2^30143440 is an apocalyptic number.

It is an amenable number.

30143440 is an abundant number, since it is smaller than the sum of its proper divisors (39940244).

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

30143440 is a wasteful number, since it uses less digits than its factorization.

30143440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376806 (or 376800 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 30143440 is about 5490.3041810086. The cubic root of 30143440 is about 311.2176872204.

Adding to 30143440 its reverse (4434103), we get a palindrome (34577543).

The spelling of 30143440 in words is "thirty million, one hundred forty-three thousand, four hundred forty".