1261140406 has 16 divisors (see below), whose sum is σ = 1942137648. Its totient is φ = 613943200.

The previous prime is 1261140403. The next prime is 1261140407. The reversal of 1261140406 is 6040411621.

It is a super-4 number, since 4×1261140406⁴ (a number of 38 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261140401) 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, 31525 + ... + 59296.

It is an arithmetic number, because the mean of its divisors is an integer number (121383603).

Almost surely, 2^1261140406 is an apocalyptic number.

1261140406 is a deficient number, since it is larger than the sum of its proper divisors (680997242).

1261140406 is a wasteful number, since it uses less digits than its factorization.

1261140406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91007.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1261140406 is about 35512.5387152200. The cubic root of 1261140406 is about 1080.4080551106.

The spelling of 1261140406 in words is "one billion, two hundred sixty-one million, one hundred forty thousand, four hundred six".