215401090 has 16 divisors (see below), whose sum is σ = 388306872. Its totient is φ = 86030464.

The previous prime is 215401079. The next prime is 215401091. The reversal of 215401090 is 90104512.

It can be written as a sum of positive squares in 4 ways, for example, as 212314041 + 3087049 = 14571^2 + 1757^2 .

It is not an unprimeable number, because it can be changed into a prime (215401091) 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, 9139 + ... + 22678.

Almost surely, 2^215401090 is an apocalyptic number.

215401090 is a deficient number, since it is larger than the sum of its proper divisors (172905782).

215401090 is a wasteful number, since it uses less digits than its factorization.

215401090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32501.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 215401090 is about 14676.5489812830. The cubic root of 215401090 is about 599.4449403767. Note that the first 3 decimals are identical.

The spelling of 215401090 in words is "two hundred fifteen million, four hundred one thousand, ninety".