1240394019 has 8 divisors (see below), whose sum is σ = 1654968000. Its totient is φ = 826374696.

The previous prime is 1240394017. The next prime is 1240394053. The reversal of 1240394019 is 9104930421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1240394019 - 2¹ = 1240394017 is a prime.

It is a super-2 number, since 2×1240394019² = 3077154644741944722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1240394011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133417 + ... + 142410.

It is an arithmetic number, because the mean of its divisors is an integer number (206871000).

Almost surely, 2^1240394019 is an apocalyptic number.

1240394019 is a deficient number, since it is larger than the sum of its proper divisors (414573981).

1240394019 is a wasteful number, since it uses less digits than its factorization.

1240394019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277329.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 1240394019 is about 35219.2279727992. The cubic root of 1240394019 is about 1074.4508517389.

The spelling of 1240394019 in words is "one billion, two hundred forty million, three hundred ninety-four thousand, nineteen".