1373640261 has 16 divisors (see below), whose sum is σ = 2144220288. Its totient is φ = 765792000.

The previous prime is 1373640211. The next prime is 1373640269. The reversal of 1373640261 is 1620463731.

It is not a de Polignac number, because 1373640261 - 2⁹ = 1373639749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1373640269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 796840 + ... + 798561.

It is an arithmetic number, because the mean of its divisors is an integer number (134013768).

Almost surely, 2^1373640261 is an apocalyptic number.

It is an amenable number.

1373640261 is a deficient number, since it is larger than the sum of its proper divisors (770580027).

1373640261 is a wasteful number, since it uses less digits than its factorization.

1373640261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1595452.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 1373640261 is about 37062.6531834946. The cubic root of 1373640261 is about 1111.6233750016.

The spelling of 1373640261 in words is "one billion, three hundred seventy-three million, six hundred forty thousand, two hundred sixty-one".