6989940 has 36 divisors (see below), whose sum is σ = 21203364. Its totient is φ = 1863936.

The previous prime is 6989933. The next prime is 6989947. The reversal of 6989940 is 499896.

It is an interprime number because it is at equal distance from previous prime (6989933) and next prime (6989947).

It can be written as a sum of positive squares in 2 ways, for example, as 1954404 + 5035536 = 1398^2 + 2244^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×6989940² = 97718522407200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6989947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19237 + ... + 19596.

Almost surely, 2^6989940 is an apocalyptic number.

6989940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6989940 is an abundant number, since it is smaller than the sum of its proper divisors (14213424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6989940 is a wasteful number, since it uses less digits than its factorization.

6989940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38848 (or 38843 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 6989940 is about 2643.8494662140. The cubic root of 6989940 is about 191.2014358301.

It can be divided in two parts, 69 and 89940, that added together give a palindrome (90009).

The spelling of 6989940 in words is "six million, nine hundred eighty-nine thousand, nine hundred forty".