1391168890 has 16 divisors (see below), whose sum is σ = 2504847240. Its totient is φ = 556302400.

The previous prime is 1391168881. The next prime is 1391168903. The reversal of 1391168890 is 988611931.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1156068001 + 235100889 = 34001^2 + 15333^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1391168890.

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, 18216 + ... + 55804.

Almost surely, 2^1391168890 is an apocalyptic number.

1391168890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1391168890 is a deficient number, since it is larger than the sum of its proper divisors (1113678350).

1391168890 is a wasteful number, since it uses less digits than its factorization.

1391168890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41297.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 1391168890 is about 37298.3765062234. The cubic root of 1391168890 is about 1116.3317728442.

The spelling of 1391168890 in words is "one billion, three hundred ninety-one million, one hundred sixty-eight thousand, eight hundred ninety".