215401340 has 48 divisors (see below), whose sum is σ = 563963904. Its totient is φ = 67137600.

The previous prime is 215401337. The next prime is 215401343. The reversal of 215401340 is 43104512.

It is an interprime number because it is at equal distance from previous prime (215401337) and next prime (215401343).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215401343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68396 + ... + 71475.

It is an arithmetic number, because the mean of its divisors is an integer number (11749248).

Almost surely, 2^215401340 is an apocalyptic number.

215401340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215401340 is an abundant number, since it is smaller than the sum of its proper divisors (348562564).

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

215401340 is a wasteful number, since it uses less digits than its factorization.

215401340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139898 (or 139896 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 215401340 is about 14676.5574982691. The cubic root of 215401340 is about 599.4451722870.

Adding to 215401340 its reverse (43104512), we get a palindrome (258505852).

The spelling of 215401340 in words is "two hundred fifteen million, four hundred one thousand, three hundred forty".