1948781 has 4 divisors (see below), whose sum is σ = 1951872. Its totient is φ = 1945692.

The previous prime is 1948777. The next prime is 1948783. The reversal of 1948781 is 1878491.

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 a cyclic number.

It is not a de Polignac number, because 1948781 - 2² = 1948777 is a prime.

It is a super-2 number, since 2×1948781² = 7595494771922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1948783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221 + ... + 1986.

It is an arithmetic number, because the mean of its divisors is an integer number (487968).

2^1948781 is an apocalyptic number.

It is an amenable number.

1948781 is a deficient number, since it is larger than the sum of its proper divisors (3091).

1948781 is an equidigital number, since it uses as much as digits as its factorization.

1948781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3090.

The product of its digits is 16128, while the sum is 38.

The square root of 1948781 is about 1395.9874641271. The cubic root of 1948781 is about 124.9072592102.

The spelling of 1948781 in words is "one million, nine hundred forty-eight thousand, seven hundred eighty-one".