691340 has 24 divisors (see below), whose sum is σ = 1564080. Its totient is φ = 255168.

The previous prime is 691337. The next prime is 691343. The reversal of 691340 is 43196.

It is an interprime number because it is at equal distance from previous prime (691337) and next prime (691343).

It is not an unprimeable number, because it can be changed into a prime (691343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1070 + ... + 1589.

It is an arithmetic number, because the mean of its divisors is an integer number (65170).

2⁶⁹¹³⁴⁰ is an apocalyptic number.

It is an amenable number.

691340 is an abundant number, since it is smaller than the sum of its proper divisors (872740).

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

691340 is a wasteful number, since it uses less digits than its factorization.

691340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681 (or 2679 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 691340 is about 831.4685802843. The cubic root of 691340 is about 88.4227250599.

The spelling of 691340 in words is "six hundred ninety-one thousand, three hundred forty".