1390649707 has 4 divisors (see below), whose sum is σ = 1390832856. Its totient is φ = 1390466560.

The previous prime is 1390649681. The next prime is 1390649717. The reversal of 1390649707 is 7079460931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7079460931 = 18341 ⋅385991.

It is a cyclic number.

It is not a de Polignac number, because 1390649707 - 2¹¹ = 1390647659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1390649717) 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, 79669 + ... + 95542.

It is an arithmetic number, because the mean of its divisors is an integer number (347708214).

Almost surely, 2^1390649707 is an apocalyptic number.

1390649707 is a deficient number, since it is larger than the sum of its proper divisors (183149).

1390649707 is an equidigital number, since it uses as much as digits as its factorization.

1390649707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183148.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 1390649707 is about 37291.4159961780. The cubic root of 1390649707 is about 1116.1928842215.

The spelling of 1390649707 in words is "one billion, three hundred ninety million, six hundred forty-nine thousand, seven hundred seven".