1366403990 has 16 divisors (see below), whose sum is σ = 2810888352. Its totient is φ = 468481344.

The previous prime is 1366403953. The next prime is 1366404001. The reversal of 1366403990 is 993046631.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9759959 + ... + 9760098.

It is an arithmetic number, because the mean of its divisors is an integer number (175680522).

Almost surely, 2^1366403990 is an apocalyptic number.

1366403990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1366403990 is an abundant number, since it is smaller than the sum of its proper divisors (1444484362).

1366403990 is a wasteful number, since it uses less digits than its factorization.

1366403990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19520071.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 1366403990 is about 36964.9021370272. The cubic root of 1366403990 is about 1109.6679443951.

The spelling of 1366403990 in words is "one billion, three hundred sixty-six million, four hundred three thousand, nine hundred ninety".