30521140 has 24 divisors (see below), whose sum is σ = 69025320. Its totient is φ = 11269248.

The previous prime is 30521131. The next prime is 30521149. The reversal of 30521140 is 4112503.

It is an interprime number because it is at equal distance from previous prime (30521131) and next prime (30521149).

It can be written as a sum of positive squares in 4 ways, for example, as 512656 + 30008484 = 716^2 + 5478^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30521149) 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, 58435 + ... + 58954.

It is an arithmetic number, because the mean of its divisors is an integer number (2876055).

Almost surely, 2^30521140 is an apocalyptic number.

It is an amenable number.

30521140 is an abundant number, since it is smaller than the sum of its proper divisors (38504180).

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

30521140 is a wasteful number, since it uses less digits than its factorization.

30521140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117411 (or 117409 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 30521140 is about 5524.5941027373. The cubic root of 30521140 is about 312.5121573937.

Adding to 30521140 its reverse (4112503), we get a palindrome (34633643).

The spelling of 30521140 in words is "thirty million, five hundred twenty-one thousand, one hundred forty".