1390667746 has 8 divisors (see below), whose sum is σ = 2246463324. Its totient is φ = 641846640.

The previous prime is 1390667743. The next prime is 1390667749. The reversal of 1390667746 is 6477660931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1390667743) and next prime (1390667749).

It can be written as a sum of positive squares in 2 ways, for example, as 1059828025 + 330839721 = 32555^2 + 18189^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1390667746.

It is not an unprimeable number, because it can be changed into a prime (1390667743) 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, 26743585 + ... + 26743636.

Almost surely, 2^1390667746 is an apocalyptic number.

1390667746 is a deficient number, since it is larger than the sum of its proper divisors (855795578).

1390667746 is a wasteful number, since it uses less digits than its factorization.

1390667746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53487236.

The product of its (nonzero) digits is 1143072, while the sum is 49.

The square root of 1390667746 is about 37291.6578607066. The cubic root of 1390667746 is about 1116.1977104827.

The spelling of 1390667746 in words is "one billion, three hundred ninety million, six hundred sixty-seven thousand, seven hundred forty-six".