1393539421 has 2 divisors, whose sum is σ = 1393539422. Its totient is φ = 1393539420.

The previous prime is 1393539409. The next prime is 1393539443. The reversal of 1393539421 is 1249353931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 974313796 + 419225625 = 31214^2 + 20475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1393539421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1393539461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696769710 + 696769711.

It is an arithmetic number, because the mean of its divisors is an integer number (696769711).

Almost surely, 2^1393539421 is an apocalyptic number.

It is an amenable number.

1393539421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393539421 is an equidigital number, since it uses as much as digits as its factorization.

1393539421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 40.

The square root of 1393539421 is about 37330.1409185661. The cubic root of 1393539421 is about 1116.9654839221.

The spelling of 1393539421 in words is "one billion, three hundred ninety-three million, five hundred thirty-nine thousand, four hundred twenty-one".