1390387306 has 32 divisors (see below), whose sum is σ = 2713264128. Its totient is φ = 518155440.

The previous prime is 1390387303. The next prime is 1390387337. The reversal of 1390387306 is 6037830931.

It is not an unprimeable number, because it can be changed into a prime (1390387303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192730 + ... + 199813.

It is an arithmetic number, because the mean of its divisors is an integer number (84789504).

Almost surely, 2^1390387306 is an apocalyptic number.

1390387306 is a deficient number, since it is larger than the sum of its proper divisors (1322876822).

1390387306 is a wasteful number, since it uses less digits than its factorization.

1390387306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392586.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 1390387306 is about 37287.8975808505. The cubic root of 1390387306 is about 1116.1226751791.

The spelling of 1390387306 in words is "one billion, three hundred ninety million, three hundred eighty-seven thousand, three hundred six".