1538655946 has 4 divisors (see below), whose sum is σ = 2307983922. Its totient is φ = 769327972.

The previous prime is 1538655857. The next prime is 1538655961. The reversal of 1538655946 is 6495568351.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6495568351 = 7883 ⋅823997.

It can be written as a sum of positive squares in only one way, i.e., 999255321 + 539400625 = 31611^2 + 23225^2 .

It is a super-2 number, since 2×1538655946² = 4734924240322309832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1538655893 and 1538655902.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 384663985 + ... + 384663988.

Almost surely, 2^1538655946 is an apocalyptic number.

1538655946 is a deficient number, since it is larger than the sum of its proper divisors (769327976).

1538655946 is an equidigital number, since it uses as much as digits as its factorization.

1538655946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769327975.

The product of its digits is 3888000, while the sum is 52.

The square root of 1538655946 is about 39225.7051689323. The cubic root of 1538655946 is about 1154.4642970900.

The spelling of 1538655946 in words is "one billion, five hundred thirty-eight million, six hundred fifty-five thousand, nine hundred forty-six".