1214401665 has 16 divisors (see below), whose sum is σ = 1943794368. Its totient is φ = 647430336.

The previous prime is 1214401637. The next prime is 1214401691. The reversal of 1214401665 is 5661044121.

It is not a de Polignac number, because 1214401665 - 2¹⁰ = 1214400641 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28407 + ... + 56883.

It is an arithmetic number, because the mean of its divisors is an integer number (121487148).

Almost surely, 2^1214401665 is an apocalyptic number.

1214401665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1214401665 is a deficient number, since it is larger than the sum of its proper divisors (729392703).

1214401665 is a wasteful number, since it uses less digits than its factorization.

1214401665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31328.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1214401665 is about 34848.2663126876. The cubic root of 1214401665 is about 1066.8928009600.

Adding to 1214401665 its reverse (5661044121), we get a palindrome (6875445786).

The spelling of 1214401665 in words is "one billion, two hundred fourteen million, four hundred one thousand, six hundred sixty-five".