1953381 has 4 divisors (see below), whose sum is σ = 2604512. Its totient is φ = 1302252.

The previous prime is 1953379. The next prime is 1953383. The reversal of 1953381 is 1833591.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1953379) and next prime (1953383).

It is not a de Polignac number, because 1953381 - 2¹ = 1953379 is a prime.

It is a super-2 number, since 2×1953381² = 7631394662322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1953383) 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 3 ways as a sum of consecutive naturals, for example, 325561 + ... + 325566.

It is an arithmetic number, because the mean of its divisors is an integer number (651128).

2^1953381 is an apocalyptic number.

It is an amenable number.

1953381 is a deficient number, since it is larger than the sum of its proper divisors (651131).

1953381 is an equidigital number, since it uses as much as digits as its factorization.

1953381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651130.

The product of its digits is 3240, while the sum is 30.

The square root of 1953381 is about 1397.6340722807. The cubic root of 1953381 is about 125.0054610947.

The spelling of 1953381 in words is "one million, nine hundred fifty-three thousand, three hundred eighty-one".