390187489 has 4 divisors (see below), whose sum is σ = 403642260. Its totient is φ = 376732720.

The previous prime is 390187411. The next prime is 390187493. The reversal of 390187489 is 984781093.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 984781093 = 379 ⋅2598367.

It can be written as a sum of positive squares in 2 ways, for example, as 230796864 + 159390625 = 15192^2 + 12625^2 .

It is a cyclic number.

It is not a de Polignac number, because 390187489 - 2⁷ = 390187361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390187789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6727342 + ... + 6727399.

It is an arithmetic number, because the mean of its divisors is an integer number (100910565).

Almost surely, 2^390187489 is an apocalyptic number.

It is an amenable number.

390187489 is a deficient number, since it is larger than the sum of its proper divisors (13454771).

390187489 is a wasteful number, since it uses less digits than its factorization.

390187489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13454770.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 390187489 is about 19753.1640250366. The cubic root of 390187489 is about 730.7314174149.

The spelling of 390187489 in words is "three hundred ninety million, one hundred eighty-seven thousand, four hundred eighty-nine".