261389030 has 24 divisors (see below), whose sum is σ = 547317648. Its totient is φ = 89618928.

The previous prime is 261389027. The next prime is 261389033. The reversal of 261389030 is 30983162.

261389030 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261389027) and next prime (261389033).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261389033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 266234 + ... + 267213.

It is an arithmetic number, because the mean of its divisors is an integer number (22804902).

Almost surely, 2^261389030 is an apocalyptic number.

261389030 is an abundant number, since it is smaller than the sum of its proper divisors (285928618).

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

261389030 is a wasteful number, since it uses less digits than its factorization.

261389030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533468 (or 533461 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 261389030 is about 16167.5301143990. The cubic root of 261389030 is about 639.3850130790.

The spelling of 261389030 in words is "two hundred sixty-one million, three hundred eighty-nine thousand, thirty".