215154740 has 12 divisors (see below), whose sum is σ = 451824996. Its totient is φ = 86061888.

The previous prime is 215154721. The next prime is 215154761. The reversal of 215154740 is 47451512.

It can be written as a sum of positive squares in 2 ways, for example, as 122456356 + 92698384 = 11066^2 + 9628^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5378849 + ... + 5378888.

It is an arithmetic number, because the mean of its divisors is an integer number (37652083).

Almost surely, 2^215154740 is an apocalyptic number.

215154740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215154740 is an abundant number, since it is smaller than the sum of its proper divisors (236670256).

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

215154740 is a wasteful number, since it uses less digits than its factorization.

215154740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10757746 (or 10757744 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 215154740 is about 14668.1539397431. The cubic root of 215154740 is about 599.2163287297.

The spelling of 215154740 in words is "two hundred fifteen million, one hundred fifty-four thousand, seven hundred forty".