7398642491 has 4 divisors (see below), whose sum is σ = 7499993832. Its totient is φ = 7297291152.

The previous prime is 7398642473. The next prime is 7398642521. The reversal of 7398642491 is 1942468937.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1942468937 = 127 ⋅15295031.

It is a cyclic number.

It is not a de Polignac number, because 7398642491 - 2¹⁸ = 7398380347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7398642191) 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, 50675561 + ... + 50675706.

It is an arithmetic number, because the mean of its divisors is an integer number (1874998458).

Almost surely, 2^7398642491 is an apocalyptic number.

7398642491 is a deficient number, since it is larger than the sum of its proper divisors (101351341).

7398642491 is a wasteful number, since it uses less digits than its factorization.

7398642491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101351340.

The product of its digits is 2612736, while the sum is 53.

The square root of 7398642491 is about 86015.3619477358. The cubic root of 7398642491 is about 1948.5759922216.

The spelling of 7398642491 in words is "seven billion, three hundred ninety-eight million, six hundred forty-two thousand, four hundred ninety-one".