1242657417 has 4 divisors (see below), whose sum is σ = 1656876560. Its totient is φ = 828438276.

The previous prime is 1242657401. The next prime is 1242657421. The reversal of 1242657417 is 7147562421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7147562421 = 3 ⋅2382520807.

It is not a de Polignac number, because 1242657417 - 2⁴ = 1242657401 is a prime.

It is a super-2 number, since 2×1242657417² = 3088394912050223778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242657457) 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, 207109567 + ... + 207109572.

It is an arithmetic number, because the mean of its divisors is an integer number (414219140).

Almost surely, 2^1242657417 is an apocalyptic number.

It is an amenable number.

1242657417 is a deficient number, since it is larger than the sum of its proper divisors (414219143).

1242657417 is an equidigital number, since it uses as much as digits as its factorization.

1242657417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414219142.

The product of its digits is 94080, while the sum is 39.

The square root of 1242657417 is about 35251.3463147154. The cubic root of 1242657417 is about 1075.1039861912.

The spelling of 1242657417 in words is "one billion, two hundred forty-two million, six hundred fifty-seven thousand, four hundred seventeen".