1240379521 has 2 divisors, whose sum is σ = 1240379522. Its totient is φ = 1240379520.

The previous prime is 1240379513. The next prime is 1240379531. The reversal of 1240379521 is 1259730421.

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., 834921025 + 405458496 = 28895^2 + 20136^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240379521 - 2³ = 1240379513 is a prime.

It is a super-2 number, since 2×1240379521² = 3077082712232378882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1240379531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620189760 + 620189761.

It is an arithmetic number, because the mean of its divisors is an integer number (620189761).

Almost surely, 2^1240379521 is an apocalyptic number.

It is an amenable number.

1240379521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240379521 is an equidigital number, since it uses as much as digits as its factorization.

1240379521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 1240379521 is about 35219.0221471295. The cubic root of 1240379521 is about 1074.4466655828.

The spelling of 1240379521 in words is "one billion, two hundred forty million, three hundred seventy-nine thousand, five hundred twenty-one".