1242436387 has 4 divisors (see below), whose sum is σ = 1242699976. Its totient is φ = 1242172800.

The previous prime is 1242436339. The next prime is 1242436411. The reversal of 1242436387 is 7836342421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7836342421 = 173 ⋅45296777.

It is a cyclic number.

It is not a de Polignac number, because 1242436387 - 2²³ = 1234047779 is a prime.

It is a super-2 number, since 2×1242436387² = 3087296351483227538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242436787) 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, 124593 + ... + 134194.

It is an arithmetic number, because the mean of its divisors is an integer number (310674994).

Almost surely, 2^1242436387 is an apocalyptic number.

1242436387 is a deficient number, since it is larger than the sum of its proper divisors (263589).

1242436387 is an equidigital number, since it uses as much as digits as its factorization.

1242436387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263588.

The product of its digits is 193536, while the sum is 40.

The square root of 1242436387 is about 35248.2111177291. The cubic root of 1242436387 is about 1075.0402399215.

The spelling of 1242436387 in words is "one billion, two hundred forty-two million, four hundred thirty-six thousand, three hundred eighty-seven".