1393695890 has 8 divisors (see below), whose sum is σ = 2508652620. Its totient is φ = 557478352.

The previous prime is 1393695883. The next prime is 1393695899. The reversal of 1393695890 is 985963931.

It can be written as a sum of positive squares in 2 ways, for example, as 1389723841 + 3972049 = 37279^2 + 1993^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1393695899) 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, 69684785 + ... + 69684804.

Almost surely, 2^1393695890 is an apocalyptic number.

1393695890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1393695890 is a deficient number, since it is larger than the sum of its proper divisors (1114956730).

1393695890 is a wasteful number, since it uses less digits than its factorization.

1393695890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139369596.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The square root of 1393695890 is about 37332.2366059147. The cubic root of 1393695890 is about 1117.0072872920.

The spelling of 1393695890 in words is "one billion, three hundred ninety-three million, six hundred ninety-five thousand, eight hundred ninety".