15890989 has 2 divisors, whose sum is σ = 15890990. Its totient is φ = 15890988.

The previous prime is 15890983. The next prime is 15891013. The reversal of 15890989 is 98909851.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15468489 + 422500 = 3933^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 15890989 - 2³ = 15890981 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15890981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7945494 + 7945495.

It is an arithmetic number, because the mean of its divisors is an integer number (7945495).

Almost surely, 2^15890989 is an apocalyptic number.

It is an amenable number.

15890989 is a deficient number, since it is larger than the sum of its proper divisors (1).

15890989 is an equidigital number, since it uses as much as digits as its factorization.

15890989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 49.

The square root of 15890989 is about 3986.3503358335. The cubic root of 15890989 is about 251.4106334820.

The spelling of 15890989 in words is "fifteen million, eight hundred ninety thousand, nine hundred eighty-nine".