1390280263 has 4 divisors (see below), whose sum is σ = 1394219088. Its totient is φ = 1386341440.

The previous prime is 1390280261. The next prime is 1390280299. The reversal of 1390280263 is 3620820931.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1390280263 - 2¹ = 1390280261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390280261) 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, 1968883 + ... + 1969588.

It is an arithmetic number, because the mean of its divisors is an integer number (348554772).

Almost surely, 2^1390280263 is an apocalyptic number.

1390280263 is a deficient number, since it is larger than the sum of its proper divisors (3938825).

1390280263 is an equidigital number, since it uses as much as digits as its factorization.

1390280263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3938824.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 1390280263 is about 37286.4621947430. The cubic root of 1390280263 is about 1116.0940317967.

The spelling of 1390280263 in words is "one billion, three hundred ninety million, two hundred eighty thousand, two hundred sixty-three".