7871949 has 6 divisors (see below), whose sum is σ = 11370606. Its totient is φ = 5247960.

The previous prime is 7871939. The next prime is 7871953. The reversal of 7871949 is 9491787.

It can be written as a sum of positive squares in only one way, i.e., 6200100 + 1671849 = 2490^2 + 1293^2 .

It is not a de Polignac number, because 7871949 - 2⁴ = 7871933 is a prime.

It is a d-powerful number, because it can be written as 7⁴ + 8⁷ + 7⁸ + 1 + 9 + 4⁵ + 9⁴ .

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7871939) 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 5 ways as a sum of consecutive naturals, for example, 437322 + ... + 437339.

It is an arithmetic number, because the mean of its divisors is an integer number (1895101).

Almost surely, 2^7871949 is an apocalyptic number.

It is an amenable number.

7871949 is a deficient number, since it is larger than the sum of its proper divisors (3498657).

7871949 is a wasteful number, since it uses less digits than its factorization.

7871949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874667 (or 874664 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 7871949 is about 2805.6993780518. The cubic root of 7871949 is about 198.9271637352.

It can be divided in two parts, 78 and 71949, that added together give a palindrome (72027).

The spelling of 7871949 in words is "seven million, eight hundred seventy-one thousand, nine hundred forty-nine".