1393040261 has 2 divisors, whose sum is σ = 1393040262. Its totient is φ = 1393040260.

The previous prime is 1393040227. The next prime is 1393040279. The reversal of 1393040261 is 1620403931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1303643236 + 89397025 = 36106^2 + 9455^2 .

It is a cyclic number.

It is not a de Polignac number, because 1393040261 - 2¹⁸ = 1392778117 is a prime.

It is a super-2 number, since 2×1393040261² = 3881122337533896242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1393040291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696520130 + 696520131.

It is an arithmetic number, because the mean of its divisors is an integer number (696520131).

Almost surely, 2^1393040261 is an apocalyptic number.

It is an amenable number.

1393040261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393040261 is an equidigital number, since it uses as much as digits as its factorization.

1393040261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1393040261 is about 37323.4545694795. The cubic root of 1393040261 is about 1116.8321038718.

The spelling of 1393040261 in words is "one billion, three hundred ninety-three million, forty thousand, two hundred sixty-one".