261394790 has 16 divisors (see below), whose sum is σ = 485688960. Its totient is φ = 101184960.

The previous prime is 261394789. The next prime is 261394801. The reversal of 261394790 is 97493162.

261394790 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×261394790⁴ (a number of 35 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421295 + ... + 421914.

It is an arithmetic number, because the mean of its divisors is an integer number (30355560).

Almost surely, 2^261394790 is an apocalyptic number.

261394790 is a deficient number, since it is larger than the sum of its proper divisors (224294170).

261394790 is a wasteful number, since it uses less digits than its factorization.

261394790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843247.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 261394790 is about 16167.7082482336. The cubic root of 261394790 is about 639.3897095661.

It can be divided in two parts, 261 and 394790, that multiplied together give a triangular number (103040190 = T₁₄₃₅₅).

The spelling of 261394790 in words is "two hundred sixty-one million, three hundred ninety-four thousand, seven hundred ninety".