1242490019 has 4 divisors (see below), whose sum is σ = 1253889120. Its totient is φ = 1231090920.

The previous prime is 1242490001. The next prime is 1242490021. The reversal of 1242490019 is 9100942421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9100942421 = 199 ⋅45733379.

It is a cyclic number.

It is not a de Polignac number, because 1242490019 - 2⁸ = 1242489763 is a prime.

It is a super-2 number, since 2×1242490019² = 3087562894629240722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242490049) 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, 5699387 + ... + 5699604.

It is an arithmetic number, because the mean of its divisors is an integer number (313472280).

Almost surely, 2^1242490019 is an apocalyptic number.

1242490019 is a deficient number, since it is larger than the sum of its proper divisors (11399101).

1242490019 is a wasteful number, since it uses less digits than its factorization.

1242490019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11399100.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1242490019 is about 35248.9718857160. The cubic root of 1242490019 is about 1075.0557083804.

The spelling of 1242490019 in words is "one billion, two hundred forty-two million, four hundred ninety thousand, nineteen".