1240640494 has 4 divisors (see below), whose sum is σ = 1860960744. Its totient is φ = 620320246.

The previous prime is 1240640461. The next prime is 1240640537. The reversal of 1240640494 is 4940460421.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310160122 + ... + 310160125.

It is an arithmetic number, because the mean of its divisors is an integer number (465240186).

Almost surely, 2^1240640494 is an apocalyptic number.

1240640494 is a deficient number, since it is larger than the sum of its proper divisors (620320250).

1240640494 is an equidigital number, since it uses as much as digits as its factorization.

1240640494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620320249.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 1240640494 is about 35222.7269529206. The cubic root of 1240640494 is about 1074.5220140015.

It can be divided in two parts, 12406 and 40494, that added together give a square (52900 = 230²).

The spelling of 1240640494 in words is "one billion, two hundred forty million, six hundred forty thousand, four hundred ninety-four".