30140440 has 32 divisors (see below), whose sum is σ = 73982160. Its totient is φ = 10960000.

The previous prime is 30140431. The next prime is 30140449. The reversal of 30140440 is 4404103.

30140440 = 1365² + 1366² + ... + 1380².

It is an interprime number because it is at equal distance from previous prime (30140431) and next prime (30140449).

It is a super-2 number, since 2×30140440² = 1816892246787200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30140449) 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, 33811 + ... + 34690.

Almost surely, 2^30140440 is an apocalyptic number.

It is an amenable number.

30140440 is an abundant number, since it is smaller than the sum of its proper divisors (43841720).

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

30140440 is a wasteful number, since it uses less digits than its factorization.

30140440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68523 (or 68519 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 30140440 is about 5490.0309653043. The cubic root of 30140440 is about 311.2073623201.

Adding to 30140440 its reverse (4404103), we get a palindrome (34544543).

The spelling of 30140440 in words is "thirty million, one hundred forty thousand, four hundred forty".