213690440 has 32 divisors (see below), whose sum is σ = 496316160. Its totient is φ = 82718400.

The previous prime is 213690437. The next prime is 213690443. The reversal of 213690440 is 44096312.

It is an interprime number because it is at equal distance from previous prime (213690437) and next prime (213690443).

It is not an unprimeable number, because it can be changed into a prime (213690443) 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, 84926 + ... + 87405.

It is an arithmetic number, because the mean of its divisors is an integer number (15509880).

Almost surely, 2^213690440 is an apocalyptic number.

213690440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213690440 is an abundant number, since it is smaller than the sum of its proper divisors (282625720).

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

213690440 is a wasteful number, since it uses less digits than its factorization.

213690440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172373 (or 172369 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 213690440 is about 14618.1544662793. The cubic root of 213690440 is about 597.8538510794.

The spelling of 213690440 in words is "two hundred thirteen million, six hundred ninety thousand, four hundred forty".