1242423885 has 16 divisors (see below), whose sum is σ = 1989794880. Its totient is φ = 661987200.

The previous prime is 1242423883. The next prime is 1242423911. The reversal of 1242423885 is 5883242421.

It is not a de Polignac number, because 1242423885 - 2¹ = 1242423883 is a prime.

It is a super-2 number, since 2×1242423885² = 3087234220036986450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242423883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23640 + ... + 55169.

It is an arithmetic number, because the mean of its divisors is an integer number (124362180).

Almost surely, 2^1242423885 is an apocalyptic number.

1242423885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1242423885 is a deficient number, since it is larger than the sum of its proper divisors (747370995).

1242423885 is a wasteful number, since it uses less digits than its factorization.

1242423885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79868.

The product of its digits is 122880, while the sum is 39.

The square root of 1242423885 is about 35248.0337749498. The cubic root of 1242423885 is about 1075.0366340499.

The spelling of 1242423885 in words is "one billion, two hundred forty-two million, four hundred twenty-three thousand, eight hundred eighty-five".