1395640618 has 4 divisors (see below), whose sum is σ = 2093460930. Its totient is φ = 697820308.

The previous prime is 1395640613. The next prime is 1395640639. The reversal of 1395640618 is 8160465931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 968267689 + 427372929 = 31117^2 + 20673^2 .

It is a super-2 number, since 2×1395640618² = 3895625469222843848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1395640613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348910153 + ... + 348910156.

Almost surely, 2^1395640618 is an apocalyptic number.

1395640618 is a deficient number, since it is larger than the sum of its proper divisors (697820312).

1395640618 is an equidigital number, since it uses as much as digits as its factorization.

1395640618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697820311.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 1395640618 is about 37358.2737556221. The cubic root of 1395640618 is about 1117.5265937314.

The spelling of 1395640618 in words is "one billion, three hundred ninety-five million, six hundred forty thousand, six hundred eighteen".