215739489 has 16 divisors (see below), whose sum is σ = 337632128. Its totient is φ = 119947392.

The previous prime is 215739473. The next prime is 215739527. The reversal of 215739489 is 984937512.

It is not a de Polignac number, because 215739489 - 2⁴ = 215739473 is a prime.

It is a super-2 number, since 2×215739489² = 93087054227962242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215739409) 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, 138052 + ... + 139605.

It is an arithmetic number, because the mean of its divisors is an integer number (21102008).

Almost surely, 2^215739489 is an apocalyptic number.

It is an amenable number.

215739489 is a deficient number, since it is larger than the sum of its proper divisors (121892639).

215739489 is a wasteful number, since it uses less digits than its factorization.

215739489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277704.

The product of its digits is 544320, while the sum is 48.

The square root of 215739489 is about 14688.0730186094. The cubic root of 215739489 is about 599.7586890725.

The spelling of 215739489 in words is "two hundred fifteen million, seven hundred thirty-nine thousand, four hundred eighty-nine".