1957440013 has 4 divisors (see below), whose sum is σ = 1957996348. Its totient is φ = 1956883680.

The previous prime is 1957440011. The next prime is 1957440019. The reversal of 1957440013 is 3100447591.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1059958249 + 897481764 = 32557^2 + 29958^2 .

It is a cyclic number.

It is not a de Polignac number, because 1957440013 - 2¹ = 1957440011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1957440011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272856 + ... + 279937.

It is an arithmetic number, because the mean of its divisors is an integer number (489499087).

Almost surely, 2^1957440013 is an apocalyptic number.

It is an amenable number.

1957440013 is a deficient number, since it is larger than the sum of its proper divisors (556335).

1957440013 is an equidigital number, since it uses as much as digits as its factorization.

1957440013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556334.

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

The square root of 1957440013 is about 44242.9656894743. The cubic root of 1957440013 is about 1250.9198590281.

The spelling of 1957440013 in words is "one billion, nine hundred fifty-seven million, four hundred forty thousand, thirteen".