1953981 has 12 divisors (see below), whose sum is σ = 2839200. Its totient is φ = 1294920.

The previous prime is 1953977. The next prime is 1953983. The reversal of 1953981 is 1893591.

It is a happy number.

It is not a de Polignac number, because 1953981 - 2² = 1953977 is a prime.

It is a super-2 number, since 2×1953981² = 7636083496722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1953983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1246 + ... + 2336.

It is an arithmetic number, because the mean of its divisors is an integer number (236600).

2^1953981 is an apocalyptic number.

It is an amenable number.

1953981 is a deficient number, since it is larger than the sum of its proper divisors (885219).

1953981 is a wasteful number, since it uses less digits than its factorization.

1953981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296 (or 1293 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1953981 is about 1397.8487042595. The cubic root of 1953981 is about 125.0182586662.

The spelling of 1953981 in words is "one million, nine hundred fifty-three thousand, nine hundred eighty-one".