1206381 has 16 divisors (see below), whose sum is σ = 1774080. Its totient is φ = 723120.

The previous prime is 1206377. The next prime is 1206383. The reversal of 1206381 is 1836021.

It is not a de Polignac number, because 1206381 - 2² = 1206377 is a prime.

It is a super-2 number, since 2×1206381² = 2910710234322, which contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206383) 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, 4456 + ... + 4718.

It is an arithmetic number, because the mean of its divisors is an integer number (110880).

2^1206381 is an apocalyptic number.

1206381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1206381 is a deficient number, since it is larger than the sum of its proper divisors (567699).

1206381 is a wasteful number, since it uses less digits than its factorization.

1206381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1206381 is about 1098.3537681458. The cubic root of 1206381 is about 106.4538802710.

The spelling of 1206381 in words is "one million, two hundred six thousand, three hundred eighty-one".